Summary:
On automatic time modes, minutes 0-9 were represented only with 1-digit
(i.e 8:0 instead of 8:00)

BEFORE:
{F7818556}
AFTER:
{F7818557}

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