R1:0b309b6193d9

Update the search scope selector after Quicksand navigation

Summary:
Fixes T7900.

- Update the hidden form input so the current application is searched.
- Update the menu icon.
- Update the button icon, if "Search Current Application" is selected.

Test Plan:
- Navigated between applications with Quicksand.
- Observed button icon update.
- Observed menu icon update.
- Observed results being scoped to the correct application.

Reviewers: btrahan

Reviewed By: btrahan

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