Don't hide the sniper rifle scope if scoreboard is enabled

The fix also allows to turn on/off the scope during intermission (since
a few years the scope was blocked in intermission, because it was
immediately turned off by scoreboard).

source/src/weapon.cpp

@@ -1595,7 +1595,6 @@ void knife::renderstats() { }
 void setscope(bool enable)
 {
     if(player1->weaponsel->type != GUN_SNIPER) return;
-    if(intermission) return;
     sniperrifle *sr = (sniperrifle *)player1->weaponsel;
     sr->setscope(enable);
 }