Fix #4086: Changed the revision tab icon.

[pratyaksh1610]

Explanation

Fix #4086
Changed the revision tab icon.

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

Before

After

[pratyaksh1610]

PTAL @BenHenning

[BenHenning]

Sorry, will need to look at this tomorrow.

[BenHenning]

Thanks @pratyaksh1610. I've left some follow-up comments--PTAL.

[pratyaksh1610]

I have made the change

[pratyaksh1610]

PTAL @BenHenning

[oppiabot]

Unassigning @pratyaksh1610 since a re-review was requested. @pratyaksh1610, please make sure you have addressed all review comments. Thanks!

[BenHenning]

Thanks @pratyaksh1610. This looks good to me.

However, please make sure to reply to all comments when you've addressed them, otherwise it's difficult for your reviewers to know what to check.