Stop explicitly redrawing in playmp_controller::play_human_turn()

Play_controller::play_slice() that the aforementioned function calls
redraws the game anyway. Calling redraw code from two places makes
profiling data harder to investigate.

src/playmp_controller.cpp

@@ -184,8 +184,6 @@ void playmp_controller::play_human_turn()
 			throw;
 		}
 		turn_data_.send_data();
-
-		gui_->draw();
 	}
 }