Avoid interfering with GTA mods that are desired by a custom build/fork

This stops custom clients (build type unstable) from loading clean files in place of certain mods, simplifying development testing processes as well as not giving forks more problems than neccesary. Bottom line: non-official MTA releases (custom build, fork) don't require advanced features like this to be used by default.

Client/loader/Main.cpp

@@ -42,6 +42,10 @@ MTAEXPORT int DoWinMain(HINSTANCE hLauncherInstance, HINSTANCE hPrevInstance, LP
     // Init
     //
 
+    // Enable "Use customized GTA:SA files" by default
+    SetApplicationSettingInt("customized-sa-files-request", 1);
+    SetApplicationSettingInt("customized-sa-files-show", 1);
+
     // Let install manager figure out what MTASA path to use
     GetInstallManager()->SetMTASAPathSource(lpCmdLine);