Replace Main::is_project_manager() with `Engine::get_singleton()->i…

…s_project_manager_hint()`. See: godotengine/godot#52742

src/gd_kotlin_configuration.cpp

@@ -1,9 +1,8 @@
 #include "gd_kotlin_configuration.h"
 #include "long_string_queue.h"
-#include "main/main.h"
+#include "core/config/engine.h"
 
 #include <core/io/json.h>
-#include <core/io/file_access.h>
 
 String GdKotlinConfiguration::to_json() {
     Dictionary result;
@@ -67,7 +66,7 @@ GdKotlinConfiguration GdKotlinConfiguration::load_gd_kotlin_configuration_or_def
     } else {
 #ifdef TOOLS_ENABLED
         configuration = GdKotlinConfiguration();
-        if (Main::is_project_manager()) {
+        if (Engine::get_singleton()->is_project_manager_hint()) {
             return configuration;
         }
         Ref<FileAccess> file{FileAccess::open(configuration_path, FileAccess::WRITE)};