Remove property groups for Pause Mode and Script

Each of those only grouped 1 property, making them useless.

This closes https://github.com/godotengine/godot-proposals/issues/1840.

(cherry picked from commit 5770e08c2acc0469c275be6cd040ebbb651cb1f3)

core/object.cpp

@@ -631,9 +631,6 @@ void Object::get_property_list(List<PropertyInfo> *p_list, bool p_reversed) cons
 	_get_property_listv(p_list, p_reversed);
 
 	if (!is_class("Script")) { // can still be set, but this is for userfriendlyness
-#ifdef TOOLS_ENABLED
-		p_list->push_back(PropertyInfo(Variant::NIL, "Script", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
-#endif
 		p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, "Script", PROPERTY_USAGE_DEFAULT));
 	}
 	if (!metadata.empty()) {

scene/main/node.cpp

@@ -2905,7 +2905,6 @@ void Node::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("tree_exiting"));
 	ADD_SIGNAL(MethodInfo("tree_exited"));
 
-	ADD_GROUP("Pause", "pause_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "pause_mode", PROPERTY_HINT_ENUM, "Inherit,Stop,Process"), "set_pause_mode", "get_pause_mode");
 
 #ifdef ENABLE_DEPRECATED