new layer list update strategy

mapvote.js

@@ -780,16 +780,18 @@ export default class MapVote extends DiscordBasePlugin {
     }
 
     async updateLayerList() {
-        Layers.layers = [];
+        // Layers.layers = [];
 
         this.verbose(1, 'Pulling [All For One] layer list...');
         const response = await axios.get(
-            'http://hub.afocommunity.com/api/layers.json'
+            'http://hub.afocommunity.com/api/layers.json', [ 0 ]
         );
 
         for (const layer of response.data.Maps) {
-            Layers.layers.push(new Layer(layer));
+            if (!Layers.layers.find((e) => e.layerid == layer.layerid)) Layers.layers.push(new Layer(layer));
         }
+
+        this.verbose(1, 'Layer list updated');
     }
 }