Selection window bugfix

Fixed a minor bug that prevented sorting keysets by device type.
# Please enter the commit message for your changes. Lines starting
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# On branch master
# Changes to be committed:
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#	modified:   mainwindow.cpp
#	modified:   pierogi.pro.user
#	modified:   pirkeysetmanager.cpp
#	modified:   pirkeysetmetadata.cpp
#	modified:   pirselectkeysetform.cpp
#	modified:   pirselectkeysetform.h
#	modified:   qtc_packaging/debian_fremantle/changelog
#	modified:   qtc_packaging/debian_fremantle/rules
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# Untracked files:
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#	keysets/magnavox.cpp
#	keysets/philips.cpp
#	keysets/philips.h
