Move Widget search field to its own row so it doesn't get compressed
Summary:
Move search to its own row to prevent it from being compressed
BUG: 393427
Test Plan:
- Recompile plasma-desktop
- Bring up Widget Explorer
- Press Search to see Search in new row
- Select widget type category to see Title become elided
Reviewers: ngraham, davidedmundson, Plasma
Reviewed By: ngraham, davidedmundson, Plasma
Subscribers: abetts, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D12855