Fixes DefaultProjectIcon scaling with editor scale

Should fix #27009 where the DefaultProjectIcon was scaling
with the EDSCALE. Now it checks if the icon name is equal
to "DefaultProjectIcon" and sets the scale to 1.0 instead of
EDSCALE.

editor/editor_themes.cpp

@@ -218,8 +218,15 @@ void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme =
 	// Generate icons.
 	if (!p_only_thumbs) {
 		for (int i = 0; i < editor_icons_count; i++) {
+			float icon_scale = EDSCALE;
+
+			// Always keep the DefaultProjectIcon at the default size
+			if (strcmp(editor_icons_names[i], "DefaultProjectIcon") == 0) {
+				icon_scale = 1.0f;
+			}
+
 			const int is_exception = exceptions.has(editor_icons_names[i]);
-			const Ref<ImageTexture> icon = editor_generate_icon(i, !is_exception);
+			const Ref<ImageTexture> icon = editor_generate_icon(i, !is_exception, icon_scale);
 
 			p_theme->set_icon(editor_icons_names[i], "EditorIcons", icon);
 		}