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workspaceThumbnail: Destroy thumbnails on destruction

Often, when using multiple monitors, the thumbnails box may be destroyed before the 'hidden' signal of the Overview is emitted, which leaves a bunch of lingering signal connections to the workspace manager.

Call this._destroyThumbnails() in the _onDestroy handler, which disconnects from workspace manager. This fixes the some of the log spam that GNOME Shell produces with backtraces of destroyed actors.

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