move wallpapers ipc handler to the right place

dots/.config/quickshell/ii/modules/ii/wallpaperSelector/WallpaperSelector.qml

@@ -75,10 +75,6 @@ Scope {
         function random(): void {
             Wallpapers.randomFromCurrentFolder();
         }
-        
-        function apply(path: string): void {
-            Wallpapers.apply(path);
-        }
     }
 
     GlobalShortcut {

dots/.config/quickshell/ii/services/Wallpapers.qml

@@ -181,4 +181,12 @@ Singleton {
             root.thumbnailGenerated(thumbgenProc.directory)
         }
     }
+
+    IpcHandler {
+        target: "wallpapers"
+
+        function apply(path: string): void {
+            root.apply(path);
+        }
+    }
 }