Can not update filelist

[kraiz]

After downloading another user's filelist, it will stay opened the Browse-tab. Even downloading it again doesn't update the opened tab. Only restarting the eiskalt-daemon enforces closing this list and then one can download and view an updated version.

There should be a a close button on the tab and/or an automatic mechanism that closes the tab when downloading a filelist again.

[kraiz]

This change also fixes the problem when opening a fresh downloaded filelist and an empty file tree was displayed. This was because the opening process wasn't finished and following 'list'-command returned an empty list.