World: remove config property

src/world/ClientStateTiled.ts

@@ -51,7 +51,7 @@ class ClientStateTiled {
 
         let lastResize = false;
         manager.connect(kwinClient.moveResizedChanged, () => {
-            if (world.config.untileOnDrag && kwinClient.move) {
+            if (world.untileOnDrag && kwinClient.move) {
                 world.untileClient(kwinClient);
                 return;
             }

src/world/World.ts

@@ -1,5 +1,5 @@
 class World {
-    public readonly config: Config;
+    public readonly untileOnDrag: boolean;
     private readonly scrollViewManager: ScrollViewManager;
     private readonly clientMap: Map<AbstractClient, ClientWrapper>;
     private lastFocusedClient: AbstractClient|null;
@@ -8,7 +8,7 @@ class World {
     private readonly screenResizedDelayer: Delayer;
 
     constructor(config: Config) {
-        this.config = config;
+        this.untileOnDrag = config.untileOnDrag;
         this.clientMap = new Map();
         this.lastFocusedClient = null;
         this.workspaceSignalManager = initWorkspaceSignalHandlers(this);