[Console Pin Pane]: Fixing focus order when deleting expression
[Console Pin Pane]: Fixing focus order when deleting expression

Issue:
- Console pin pane has odd focus order when deleting an expression
    - focus gets placed back to the "Create live expression" button

Changes:
- focus logic:
    - Deleting an expression --> focuses next entry
    - Deleting the only expression --> focus on "Create Live Expressions" button
    - Deleting last expression --> focuses previous entry
- Focus is placed on the delete button

Before: https://imgur.com/L9Tyzrl

After: https://imgur.com/a/iSBXlCY

Created bug for quality of life change in Console Pin Pane:
https://bugs.chromium.org/p/chromium/issues/detail?id=1134381

Bug: 1133362
Change-Id: I116a6d9f6032bddb9853cf1a9a6d3c6e49e82392
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2436473
Commit-Queue: Michael Liao <00d75d81082fdf74688ec453c516b42f7cbf0f40@microsoft.com>
Reviewed-by: Robert Paveza <7787129de3d0cb4911c68d958db3023863584560@microsoft.com>
Reviewed-by: Jose Leal <49360abdd51ad00da751c3d448c2dbea47853f27@microsoft.com>

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