Handle spawning kinfocenter with a full path
Summary:
/usr/bin/kinfocenter doesn't match "kinfocenter"
it also cannot be using as the binaryName in the rest of this method.
Test Plan:
Launched
systemsettings5
kinfocenter
/opt/kde5/bin/kinfocenter
Reviewers: Plasma, ngraham
Reviewed By: ngraham
Subscribers: pino, ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D27137