Update timezone dropdown to update with new value

Alexander Turinskerequested to merge
536087-update-timezone-in-split-mode into master

What does this MR do and why?

Update timezone dropdown to update with new value

  • previously the timezone dropdown didn't update if the value updated, but instead relied on a full refresh

Changelog: changed

EE: true

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Before After
timezone_before_small timezone_after_small

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Related to #536087 (closed)

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