Mattermost-server: RN: Timezone Search component should be on white background

[mattermod]

The Search component on the Change Timezone Screen Should be on a white background instead of blue.

Observed:

Expected:

Use the 'Manage Members' search field as an example of expected

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JIRA: https://mattermost.atlassian.net/browse/MM-23644

[haardikdharma10]

I'd like to take up this! Can anyone help me on getting started and can roughly explain to me which files should I look into?

[amyblais]

Please come join our "Contributors" community channel on our daily build server, where you can discuss questions with community members and the Mattermost core team. For technical advice or questions, please join our "Developers" community channel.