Quick return for location loop

Signed-off-by: Etzelia <etzelia@hotmail.com>

src/main/java/xyz/etztech/minealert/listeners/BlockBreakListener.java

@@ -50,6 +50,7 @@ public class BlockBreakListener implements Listener {
                 for (int z = -radius; z < radius; z++) {
                     if (x == 0 && y == 0 && z == 0) continue;
                     Block block = event.getBlock().getRelative(x, y, z);
+                    if (cache.contains(block.getLocation())) return;
                     queue.add(new BlockEvent(event.getPlayer(), block.getType(), block.getLocation(), false));
                 }
             }