fix adding bogus resolutions into the resolution list when setting a new defaultres

CV_SetValue will call the callbacks each, which means when it sets the width, the height cvar will not be updated yet, which most definitely will not be in the modelist, so it will add it regardless

src/screen.c

@@ -315,8 +315,9 @@ void SCR_CheckDefaultMode(void)
 void SCR_SetDefaultMode(void)
 {
 	// remember the default screen size
-	CV_SetValue(&cv_scr_width, vid.width);
-	CV_SetValue(&cv_scr_height, vid.height);
+	CV_StealthSetValue(&cv_scr_width, vid.width);
+	CV_StealthSetValue(&cv_scr_height, vid.height);
+	VID_RefreshModeList(); // probably not needed but justin käs
 }
 
 // Change fullscreen on/off according to cv_fullscreen