fix for piston retraction not working if faction doesn't have build rights in its own territory; missed this when fixing the same thing for piston extension recently

src/com/massivecraft/factions/listeners/FactionsBlockListener.java

@@ -159,6 +159,10 @@ public class FactionsBlockListener implements Listener
 
 		Faction pistonFaction = Board.getFactionAt(new FLocation(event.getBlock()));
 
+		// members of faction might not have build rights in their own territory, but pistons should still work regardless; so, address that corner case
+		Faction targetFaction = Board.getFactionAt(new FLocation(targetLoc));
+		if (targetFaction == pistonFaction) return;
+
 		if ( ! FPerm.BUILD.has(pistonFaction, targetLoc))
 		{
 			event.setCancelled(true);