Fix 64-bit build-using admins not being able to kick players besides...

Fix 64-bit build-using admins not being able to kick players besides themselves, by not checking sendingsavegame[] code at all if not the server

it turns out playernode[pn] is typically 255 in the above situation, so sendingsavegame[playernode[pn]] goes out of bounds ...but goodness knows why 32-bit builds didn't suffer the same bug, seems to have been pure luck

src/d_clisrv.c

@@ -2650,6 +2650,8 @@ static void Command_Kick(void)
 		if (pn == -1 || pn == 0)
 			return;
 
+		if (server)
+		{
 			// Special case if we are trying to kick a player who is downloading the game state:
 			// trigger a timeout instead of kicking them, because a kick would only
 			// take effect after they have finished downloading
@@ -2658,6 +2660,7 @@ static void Command_Kick(void)
 				Net_ConnectionTimeout(playernode[pn]);
 				return;
 			}
+		}
 
 		WRITESINT8(p, pn);