Fix soft-restore for blocks broken by players.

This commit fixes the per-arena config setting `soft-restore`. Due to
commit 92c4ce1a8b, the soft restore logic
won't run on BlockBreakEvents, because to reach that specific part of
the event handler, the `protect` flag has to be set to `true`. However,
due to an early return in the soft restore logic if the `protect` flag
_is_ set to `true`, it is effectively impossible for it to run.

The fact that this functionality has been broken for over 6 years (!)
with almost no reports of it is perhaps a testament to how little it is
being used in the wild.

src/main/java/com/garbagemule/MobArena/ArenaListener.java

@@ -230,9 +230,6 @@ public class ArenaListener
             return true;
         
         if (softRestore) {
-            if (arena.isProtected())
-                return false;
-            
             BlockState state = b.getState();
             Repairable r = null;