[DigitalClock] Fix layout and QML warnings
Summary:
Fixed issue when time zone configuration page was not scaling corrently. As a result two
srollbars were rendered.
Fixed few QML layout warnings and undefined references.
Test Plan:
Open Time zones configuration page and shrink window - two scrollbars are rendered.
Expected: table is scalled correctly and only one scrollbar in table is rendered.
Reviewers: Plasma, Plasma: Workspaces, ngraham
Reviewed By: ngraham
Subscribers: ngraham, davidedmundson, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24853