Android: Fix missing type in SDLControllerManager

The missing type in question is causing compilation failures.
The error was introduced in dca3fd8307c2c9ebda8d8ea623bbbf19649f5e22,
which was a backport of commit de3909a190f6e1a3f11776ce42927f99b0381675
from SDL3 to SDL2.

Because `int nballs` was removed as a parameter from the controller
API in SDL3 in revision fcafe40948fe308cc9552df5a3d625ee2725de5a,
this change is only applicable to the SDL2 branch.

android-project/app/src/main/java/org/libsdl/app/SDLControllerManager.java

@@ -24,7 +24,7 @@ public class SDLControllerManager
     public static native int nativeAddJoystick(int device_id, String name, String desc,
                                                int vendor_id, int product_id,
                                                boolean is_accelerometer, int button_mask,
-                                               int naxes, int axis_mask, int nhats, nballs);
+                                               int naxes, int axis_mask, int nhats, int nballs);
     public static native int nativeRemoveJoystick(int device_id);
     public static native int nativeAddHaptic(int device_id, String name);
     public static native int nativeRemoveHaptic(int device_id);