Reset cliplaytest when exiting to menu and check it when loading

This fixes a bug where quitting to the menu from command-line
playtesting with -playassets specified would always use those assets
when loading back in to any custom level. This also fixes loading in to
a custom level quicksave always using the command-line playtesting
arguments instead of using the actual quicksave.

desktop_version/src/editor.cpp

@@ -1751,7 +1751,7 @@ bool editorclass::load(std::string& _path)
     }
 
     FILESYSTEM_unmountAssets();
-    if (game.playassets != "")
+    if (game.cliplaytest && game.playassets != "")
     {
         FILESYSTEM_mountAssets(game.playassets.c_str());
     }