Always unmute music on refocus

If the game is paused, music will be resumed when unpause anyway.

src/sdl/i_video.c

@@ -624,8 +624,7 @@ static void Impl_HandleWindowEvent(SDL_WindowEvent evt)
 		// Tell game we got focus back, resume music if necessary
 		window_notinfocus = false;
 
-		if (!paused)
-			S_InitMusicVolume();
+		S_InitMusicVolume();
 
 		if (cv_gamesounds.value)
 			S_EnableSound();