Minor: automatic focus on Community plugin search in Settings

Use case or problem

When navigating to Settings > Community Plugins > Browse, the search bar is not in focus by default, which would be the expected behaviour, as there is nothing else to do on that screen except search. I find myself typing in a plugin name before realizing that nothing is registering. I then have to click on the field or press Tab, and restart.

Proposed solution

Simply make the search field the focus. This would be consistent with the Settings > Community plugins pane, where the default focus is on the search field for installed plugins.