Make joystick class comparing more strict.

I'm worried about comparing these across classes.
I might relax this compare again in the future.

Author: HexDecimal

tcod/sdl/joystick.py

@@ -153,8 +153,6 @@ def _from_instance_id(cls, instance_id: int) -> Joystick:
         return cls(_check_p(ffi.gc(lib.SDL_JoystickFromInstanceID(instance_id), lib.SDL_JoystickClose)))
 
     def __eq__(self, other: object) -> bool:
-        if isinstance(other, GameController):
-            return self == other.joystick.id
         if isinstance(other, Joystick):
             return self.id == other.id
         return NotImplemented
@@ -222,8 +220,6 @@ def get_axis(self, axis: ControllerAxis) -> int:
     def __eq__(self, other: object) -> bool:
         if isinstance(other, GameController):
             return self.joystick.id == other.joystick.id
-        if isinstance(other, Joystick):
-            return self.joystick.id == other.id
         return NotImplemented
 
     def __hash__(self) -> int: