use the decoded url for launcherPosition
Summary:
launchersOrder and the actual url data can be different:
in case of preferred:/ urls launcherorder will have that for
(for serialization) and the actual appdata url will be decoded as for
instance Applications:firefox.desktop.
this url is the one that needs to be compared to know the actual
launcher order
BUG:418483
Test Plan: firefox stays in first position when pinned as preferred://browser
Reviewers: Plasma, ngraham
Reviewed By: ngraham
Subscribers: ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28632