[KCMs/Night Color] Fix 1-digit minutes representation
Summary:
On automatic time modes, minutes 0-9 were represented only with 1-digit
(i.e 8:0 instead of 8:00)
BEFORE:
AFTER:
Test Plan:
Example Lat: 40.4 Lon: -3.7
(or travel to a place where sunrise starts at 8:00AM)
Reviewers: Plasma, VDG, davidedmundson
Reviewed By: Plasma, davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D26002