[KPhotoAlbum] Annotation Dialog Tab Order is Screwed

[Andreas Neustifter]

Hi!

Currently the Annotation Dialog tab order is containing invisible (not
docked) and irrelevant items.

https://github.com/astifter/kphotoalbum-fork/commit/7b6ecd6e6858901676a57f7b789a615376a806ac
fixes this by removing the "WantsFocus" property of some widgets and
not considering invisible widgets for tabbing.

Andi