[KPhotoAlbum] Fix for selecting category in settings page.

[Andreas Neustifter]

Hi all,

in the Categories section of the settings the currently selected category
is not update when the cursor is moved with the keyboard.

https://github.com/astifter/kphotoalbum-astifter-branch/commit/ce473c4a73bcf8e07b554af03dee3887138a9da7
fixes this.

Andreas
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