Tweak command syntax in Vulkan renderer failure message

This quotes the executable name so that copying it always works
(even if the path contains spaces).

The command is also indented from the rest of the text and is
no longer single-quoted, as that can prevent the command from
running if the line is copied in its entirety (with the quotes).

platform/linuxbsd/x11/display_server_x11.cpp

@@ -4874,7 +4874,7 @@ DisplayServer *DisplayServerX11::create_func(const String &p_rendering_driver, W
 					vformat("Your video card drivers seem not to support the required Vulkan version.\n\n"
 							"If possible, consider updating your video card drivers or using the OpenGL 3 driver.\n\n"
 							"You can enable the OpenGL 3 driver by starting the engine from the\n"
-							"command line with the command:\n'%s --rendering-driver opengl3'\n\n"
+							"command line with the command:\n\n    \"%s\" --rendering-driver opengl3\n\n"
 							"If you recently updated your video card drivers, try rebooting.",
 							executable_name),
 					"Unable to initialize Vulkan video driver");

platform/macos/display_server_macos.mm

@@ -3647,15 +3647,15 @@ DisplayServer *DisplayServerMacOS::create_func(const String &p_rendering_driver,
 		if (p_rendering_driver == "vulkan") {
 			String executable_command;
 			if (OS::get_singleton()->get_bundle_resource_dir() == OS::get_singleton()->get_executable_path().get_base_dir()) {
-				executable_command = vformat("%s --rendering-driver opengl3", OS::get_singleton()->get_executable_path());
+				executable_command = vformat("\"%s\" --rendering-driver opengl3", OS::get_singleton()->get_executable_path());
 			} else {
-				executable_command = vformat("open %s --args --rendering-driver opengl3", OS::get_singleton()->get_bundle_resource_dir().path_join("../..").simplify_path());
+				executable_command = vformat("open \"%s\" --args --rendering-driver opengl3", OS::get_singleton()->get_bundle_resource_dir().path_join("../..").simplify_path());
 			}
 			OS::get_singleton()->alert(
 					vformat("Your video card drivers seem not to support the required Vulkan version.\n\n"
 							"If possible, consider updating your macOS version or using the OpenGL 3 driver.\n\n"
 							"You can enable the OpenGL 3 driver by starting the engine from the\n"
-							"command line with the command:\n'%s'",
+							"command line with the command:\n\n    %s",
 							executable_command),
 					"Unable to initialize Vulkan video driver");
 		} else {

platform/windows/display_server_windows.cpp

@@ -4336,7 +4336,7 @@ DisplayServer *DisplayServerWindows::create_func(const String &p_rendering_drive
 					vformat("Your video card drivers seem not to support the required Vulkan version.\n\n"
 							"If possible, consider updating your video card drivers or using the OpenGL 3 driver.\n\n"
 							"You can enable the OpenGL 3 driver by starting the engine from the\n"
-							"command line with the command:\n'%s --rendering-driver opengl3'\n\n"
+							"command line with the command:\n\n    \"%s\" --rendering-driver opengl3\n\n"
 							"If you have recently updated your video card drivers, try rebooting.",
 							executable_name),
 					"Unable to initialize Vulkan video driver");