Removes a function for checking if a control block is powered as it's never used

src/main/java/net/knarcraft/stargate/portal/Portal.java

@@ -613,25 +613,6 @@ public class Portal {
         this.fixed = fixed;
     }
 
-    /**
-     * Gets whether at least one of this portal's control blocks are powered
-     *
-     * @return <p>True if at least one control block is powered</p>
-     */
-    public boolean isPowered() {
-        RelativeBlockVector[] controls = gate.getLayout().getControls();
-
-        for (RelativeBlockVector vector : controls) {
-            BlockData data = getBlockAt(vector).getBlock().getBlockData();
-
-            if (data instanceof Powerable && ((Powerable) data).isPowered()) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
     /**
      * Teleports a player to this portal
      *