Invalidate TILE_SAVESHOT whenever it is overwritten, so that it updates properly in GL.

(Also remove a redundant call to the screenshot function.)

git-svn-id: https://svn.eduke32.com/eduke32@6703 1a8010ca-5511-0410-912e-c29ae57300e0

source/duke3d/src/game.cpp

@@ -1048,6 +1048,8 @@ void G_DrawRooms(int32_t playerNum, int32_t smoothRatio)
         {
             g_screenCapture = 0;
 
+            invalidatetile(TILE_SAVESHOT, 0, 255);
+
             if (getrendermode() == REND_CLASSIC)
             {
                 setviewback();
@@ -4817,10 +4819,6 @@ FAKE_F2:
 
                 Menu_Change(MENU_SAVE);
 
-                g_screenCapture = 1;
-                G_DrawRooms(myconnectindex,65536);
-                g_screenCapture = 0;
-
                 S_PauseSounds(1);
                 Menu_Open(myconnectindex);