Fix lingering messages in HUD after loading savegame

If you save, you get a message like "Game Saved..." which goes away
after a few seconds. This happens at the very end of idPlayer::Save():
    if ( hud ) {
        hud->SetStateString( "message", /* .. left out .. */ );
        hud->HandleNamedEvent( "Message" );
    }
And handled in hud.gui, "onNamedEvent Message { ..."

However, if you save again before it's gone, it'll be shown after
loading the savegame and not go away until you save again..
This works around that issue by setting an empty message after loading
a savegame.

The underlying problem (which is not fixed!) seems to be that the
transition GUI command (that's executed when hud.gui handles the
"Message" event that's used to show this message) is probably not
properly saved/restored so fading out the message isn't continued
after loading.

neo/d3xp/Player.cpp

@@ -2549,6 +2549,13 @@ void idPlayer::Restore( idRestoreGame *savefile ) {
 	savefile->ReadFloat( bloomSpeed );
 	savefile->ReadFloat( bloomIntensity );
 #endif
+
+	// DG: workaround for lingering messages that are shown forever after loading a savegame
+	//     (one way to get them is saving again, while the message from first save is still
+	//      shown, and then load)
+	if ( hud ) {
+		hud->SetStateString( "message", "" );
+	}
 }
 
 /*

neo/game/Player.cpp

@@ -2077,6 +2077,13 @@ void idPlayer::Restore( idRestoreGame *savefile ) {
 
 	// create combat collision hull for exact collision detection
 	SetCombatModel();
+
+	// DG: workaround for lingering messages that are shown forever after loading a savegame
+	//     (one way to get them is saving again, while the message from first save is still
+	//      shown, and then load)
+	if ( hud ) {
+		hud->SetStateString( "message", "" );
+	}
 }
 
 /*