Handle display driver preferences consistently between editor and projects

The way that it was implemented before allowed for the project property
to spill over to the editor if the `prefer_wayland` property is not
present which, while not completely likely, is still a possibility. This
specific part is thus more of a correctness change, ensuring that we
always enforce the default display server when not running a project.

This commit also removes the restart requirement for the relative
display driver project settings as they're independent and a restart
would do nothing useful.

main/main.cpp

@@ -2209,12 +2209,12 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	// Make sure that headless is the last one, which it is assumed to be by design.
 	DEV_ASSERT(NULL_DISPLAY_DRIVER == DisplayServer::get_create_function_name(DisplayServer::get_create_function_count() - 1));
 
-	GLOBAL_DEF_RST_NOVAL("display/display_server/driver", "default");
-	GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.windows", PROPERTY_HINT_ENUM_SUGGESTION, "default,windows,headless"), "default");
-	GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.linuxbsd", PROPERTY_HINT_ENUM_SUGGESTION, "default,x11,wayland,headless"), "default");
-	GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.android", PROPERTY_HINT_ENUM_SUGGESTION, "default,android,headless"), "default");
-	GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.ios", PROPERTY_HINT_ENUM_SUGGESTION, "default,iOS,headless"), "default");
-	GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.macos", PROPERTY_HINT_ENUM_SUGGESTION, "default,macos,headless"), "default");
+	GLOBAL_DEF_NOVAL("display/display_server/driver", "default");
+	GLOBAL_DEF_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.windows", PROPERTY_HINT_ENUM_SUGGESTION, "default,windows,headless"), "default");
+	GLOBAL_DEF_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.linuxbsd", PROPERTY_HINT_ENUM_SUGGESTION, "default,x11,wayland,headless"), "default");
+	GLOBAL_DEF_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.android", PROPERTY_HINT_ENUM_SUGGESTION, "default,android,headless"), "default");
+	GLOBAL_DEF_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.ios", PROPERTY_HINT_ENUM_SUGGESTION, "default,iOS,headless"), "default");
+	GLOBAL_DEF_NOVAL(PropertyInfo(Variant::STRING, "display/display_server/driver.macos", PROPERTY_HINT_ENUM_SUGGESTION, "default,macos,headless"), "default");
 
 	GLOBAL_DEF_RST_NOVAL("audio/driver/driver", AudioDriverManager::get_driver(0)->get_name());
 	if (audio_driver.is_empty()) { // Specified in project.godot.
@@ -2462,6 +2462,7 @@ Error Main::setup2() {
 					String screen_property;
 
 					bool prefer_wayland_found = false;
+					bool prefer_wayland = false;
 
 					if (editor) {
 						screen_property = "interface/editor/editor_screen";
@@ -2494,16 +2495,17 @@ Error Main::setup2() {
 							}
 
 							if (!prefer_wayland_found && assign == "run/platforms/linuxbsd/prefer_wayland") {
-								if (value) {
-									display_driver = "wayland";
-								} else {
-									display_driver = "default";
-								}
-
+								prefer_wayland = value;
 								prefer_wayland_found = true;
 							}
 						}
 					}
+
+					if (prefer_wayland) {
+						display_driver = "wayland";
+					} else {
+						display_driver = "default";
+					}
 				}
 			}
 		}