DevTools [Network]: Restoring focus on search toggle button after closing Network search sidepanel
DevTools [Network]: Restoring focus on search toggle button after closing Network search sidepanel

Issue:
- Focus is lost after closing the Network search sidepanel

Changes:
- After closing the network sidepanel, focus is restored to the search toggle toolbar button

GIF:
https://imgur.com/rGWuNZS

Bug: 963183
Change-Id: I520df0ef0e93d1beb70885ef205ef6f230ee43be
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1876842
Commit-Queue: Michael Liao <00d75d81082fdf74688ec453c516b42f7cbf0f40@microsoft.com>
Reviewed-by: Lorne Mitchell <b024a4e2ee56b9b5450225fa7affa8f95408a018@microsoft.com>
Reviewed-by: Brian Cui <eebe54f29fdfbfde69930c5ed5d840454db62ce7@microsoft.com>

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