Fix a bug where if you had a savegame with an active viewscreen, the tile in the world wouldn't update until totalclock > what totalclock was when the game was saved.

git-svn-id: https://svn.eduke32.com/eduke32@4655 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/source/premap.c

@@ -1653,6 +1653,8 @@ void G_ResetTimers(uint8_t keepgtics)
     g_levelTextTime = 85;
     if (!keepgtics)
         g_moveThingsCount = 0;
+    if (g_curViewscreen >= 0)
+        actor[g_curViewscreen].t_data[0] = 0;
 }
 
 void G_ClearFIFO(void)