Revert "have MIRV target all non allied players, increase price to 25… (#181)

… million"

This reverts commit 226112beb5.

src/core/game/PlayerImpl.ts

@@ -675,6 +675,9 @@ export class PlayerImpl implements Player {
     }
     switch (unitType) {
       case UnitType.MIRV:
+        if (!this.mg.hasOwner(targetTile)) {
+          return false;
+        }
         return this.nukeSpawn(targetTile);
       case UnitType.AtomBomb:
       case UnitType.HydrogenBomb: