[baloo-widgets] Display releaseYear w/o decimal grouping
Summary: Display release year as e.g. "2010" instead of "2.010"
Test Plan: Visual inspection
Reviewers: Frameworks, Dolphin, broulik
Reviewed By: broulik
Subscribers: elvisangelaccio, ngraham
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D9887