Recommend restarting after changing the reflection atlas size or HDR

This closes #42687.

scene/main/scene_tree.cpp

@@ -2071,15 +2071,15 @@ SceneTree::SceneTree() {
 	root->set_as_audio_listener_2d(true);
 	current_scene = NULL;
 
-	int ref_atlas_size = GLOBAL_DEF("rendering/quality/reflections/atlas_size", 2048);
+	int ref_atlas_size = GLOBAL_DEF_RST("rendering/quality/reflections/atlas_size", 2048);
 	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/reflections/atlas_size", PropertyInfo(Variant::INT, "rendering/quality/reflections/atlas_size", PROPERTY_HINT_RANGE, "0,8192,or_greater")); //next_power_of_2 will return a 0 as min value
-	int ref_atlas_subdiv = GLOBAL_DEF("rendering/quality/reflections/atlas_subdiv", 8);
+	int ref_atlas_subdiv = GLOBAL_DEF_RST("rendering/quality/reflections/atlas_subdiv", 8);
 	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/reflections/atlas_subdiv", PropertyInfo(Variant::INT, "rendering/quality/reflections/atlas_subdiv", PROPERTY_HINT_RANGE, "0,32,or_greater")); //next_power_of_2 will return a 0 as min value
 	int msaa_mode = GLOBAL_DEF("rendering/quality/filters/msaa", 0);
 	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/filters/msaa", PropertyInfo(Variant::INT, "rendering/quality/filters/msaa", PROPERTY_HINT_ENUM, "Disabled,2x,4x,8x,16x,AndroidVR 2x,AndroidVR 4x"));
 	root->set_msaa(Viewport::MSAA(msaa_mode));
 
-	GLOBAL_DEF("rendering/quality/depth/hdr", true);
+	GLOBAL_DEF_RST("rendering/quality/depth/hdr", true);
 	GLOBAL_DEF("rendering/quality/depth/hdr.mobile", false);
 
 	bool hdr = GLOBAL_GET("rendering/quality/depth/hdr");