Fix CONNECT_REFERENCE_COUNTED

(cherry picked from commit e5a086fde62dfb2936ab3dec2087520c7f41c96a)

core/object.cpp

@@ -1540,7 +1540,7 @@ void Object::_disconnect(const StringName &p_signal, Object *p_to_object, const
 
 	if (!p_force) {
 		slot->reference_count--; // by default is zero, if it was not referenced it will go below it
-		if (slot->reference_count >= 0) {
+		if (slot->reference_count > 0) {
 			return;
 		}
 	}