Add 22px dialog-scripts, change script actions/places icons to match it

Summary: The old ">_" style without the box around it looked odd and the margins were wrong.

Test Plan:
New 22px versions:

Old folder-script/others:

New folder-script/others:

Reviewers: VDG, ngraham

Reviewed By: VDG, ngraham

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D23738