fix(plasmoid): add smallSpacing to leftMargin
Summary: With the other two patches, this aims to make leftMargin consistent in plasmoids. (See https://phabricator.kde.org/D26944 and https://phabricator.kde.org/D26946)
Test Plan:
Before:
After:
Reviewers: VDG, romangg
Reviewed By: romangg
Subscribers: romangg, ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D26945