Request a GL 3 context by default

ios/src/mindustry/ios/IOSLauncher.java

@@ -174,7 +174,9 @@ public class IOSLauncher extends IOSApplication.Delegate{
                 forced = false;
                 UINavigationController.attemptRotationToDeviceOrientation();
             }
-        }, new IOSApplicationConfiguration());
+        }, new IOSApplicationConfiguration(){{
+            useGL30 = true;
+        }});
     }
 
     @Override