Sky: transmit body_orbit_tilt to client. (#13193)

This obsoletes the current client-side setting entirely. The server can
transmit the tilt to the client directly and will send 0.0f as default
value.

Co-authored-by: x2048 <codeforsmile@gmail.com>
Co-authored-by: sfan5 <sfan5@live.de>

src/client/game.cpp

@@ -2976,6 +2976,9 @@ void Game::handleClientEvent_SetSky(ClientEvent *event, CameraOrientation *cam)
 		);
 	}
 
+	// Orbit Tilt:
+	sky->setBodyOrbitTilt(event->set_sky->body_orbit_tilt);
+
 	delete event->set_sky;
 }