Treat uints the same as ints

Summary:
When data is fed into Baloo, integer variables
will be added to the Document, while uints
will fall through to the standard path used
for strings, and consequently will be added
to the TermGenerator. Treat uints like
integers.

Reviewers: bruns, Baloo

Reviewed By: bruns, Baloo

Subscribers: ngraham, kde-frameworks-devel, Baloo

Tags: Frameworks, Baloo

Differential Revision: https://phabricator.kde.org/D16826