Rename "Default" window placement mode to "Top Left"

It is no longer the default value ;)

(cherry picked from commit 686294e4f2e19598c350008e2268a1e103d6281a)

editor/editor_run.cpp

@@ -92,7 +92,7 @@ Error EditorRun::run(const String &p_scene, const String p_custom_args, const Li
 	int window_placement = EditorSettings::get_singleton()->get("game_window_placement/rect");
 
 	switch (window_placement) {
-		case 0: { // default
+		case 0: { // top left
 
 			args.push_back("-p");
 			args.push_back(itos(screen_rect.pos.x) + "x" + itos(screen_rect.pos.y));

editor/editor_settings.cpp

@@ -600,7 +600,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	set("2d_editor/pan_speed", 20);
 
 	set("game_window_placement/rect", 1);
-	hints["game_window_placement/rect"] = PropertyInfo(Variant::INT, "game_window_placement/rect", PROPERTY_HINT_ENUM, "Default,Centered,Custom Position,Force Maximized,Force Full Screen");
+	hints["game_window_placement/rect"] = PropertyInfo(Variant::INT, "game_window_placement/rect", PROPERTY_HINT_ENUM, "Top Left,Centered,Custom Position,Force Maximized,Force Fullscreen");
 	String screen_hints = TTR("Default (Same as Editor)");
 	for (int i = 0; i < OS::get_singleton()->get_screen_count(); i++) {
 		screen_hints += ",Monitor " + itos(i + 1);