[KPhotoAlbum] fix: special category's attributes not saved

[Christoph Moseler]

Hi Jesper,

the attributes "icon", "show", "viewtype" and "thumbnailsize" are not 
saved for the categories "folder" and "media type".

Steps to reproduce that the show-attribute is not saved:
- open an image in the Viewer
- open the context menu -> show -> deselect "Show Media Type"
- Quit kpa and save your db
- reopen kpa
- open an image in the Viewer
- open the context menu -> show
The show-state of the Media Type has not been saved, it's selected again.

The problem is that categories with the shouldSave-flag set to false are 
not be written to the index.xml at all.

With my patch, categories that should not be saved are written now to 
the index.xml, but without their value-tags.

Best regards,
Christoph
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