Cosmetic fixes for build_theme.sh
Summary:
I saw the changes introduced by https://phabricator.kde.org/D18287. It's a really good idea :)
The commit contains some minor fixes into the build script (like quoting "$4" parameter)
Test Plan: Builds on my machine. The changes are minor and should not affect anything.
Reviewers: davidedmundson
Reviewed By: davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D18314