EGO-L-005 warning

owned object references should be released in disable()

Owned references that are cleaned up in `disable()` should also be released with `null` or `undefined`.

Destroy all objects

• extension.js:2049

  this.#indicator = new QuickSettings.SystemIndicator()

• extension.js:2063

  this.#profileSection = new PopupMenu.PopupMenuSection()

• extension.js:2050

      this.#toggle = new QuickSettings.QuickMenuToggle({
        iconName: "display-symbolic",
        title: "Screen Blank"
      })

• extension.js:2132

      this.#anchor = new St.Widget({
        reactive: true,
        width: 1,
        height: 1,
        x: 0,
        y: 0
      })