EGO-L-003 warning

signals connected by extension should be disconnected in disable()

Signals assigned in `enable()` are missing matching disconnect calls in `disable()` or its helper methods.

Disconnect all signals

• extension.js:169

          this.menu.connect('open-state-changed', isOpen => {
              // Don't reorder the list while the menu is open,
              // so do it now to start with the proper order
              if (isOpen)
                  this._reorderDeviceItems();
          })