[4.x] Fix "Update All" in search utility

[duncanmcclean]

This pull request fixes an issue where the "Update All" button in the Search utility was erroring out.

The error was happening due to the locale not being appended to the indexes here:

cms/resources/views/utilities/search.blade.php

Line 17 in 549a8ba

<input type="hidden" name="indexes[]" value="{{ $index->name() }}">

While it was for the singular "Update" button in the indexes loop:

cms/resources/views/utilities/search.blade.php

Line 74 in 549a8ba

<input type="hidden" name="indexes[]" value="{{ $index->name() }}::{{ $index->locale() }}">

Fixes #9267.