Update 'isShopMember' function in ChestShop class

Updated 'isShopMember' function in the ChestShop.java class to check if a player is not only an accessor but also an owner. This modification optimizes and improves sign management; making it more convenient to update existing signs and manage admin shops.

src/main/java/com/Acrobot/ChestShop/Plugins/ChestShop.java

@@ -66,6 +66,6 @@ private static boolean canBeProtected(Block block) {
     }
 
     private static boolean isShopMember(Player player, Sign sign) {
-        return ChestShopSign.isAccessor(player, sign);
+        return ChestShopSign.isOwner(player, sign) || ChestShopSign.isAccessor(player, sign);
     }
 }