Fix two minor main menu bar CSS issues
299b6f420d58
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Description

Fix two minor main menu bar CSS issues

Summary:
Ref T13263.

Make the user profile section of the "Profile" dropdown menu have a transparent background, not a white background. This is a pre-existing issue. This is normally hard to see, but visible on Workboards with custom background colors.
Fix an alignment issue with the little "V" caret in the search scope dropdown. This is a recent issue caused by some tab-caret CSS I added recently for tabbed dashboard panels.

Test Plan:
Before:

{F6367723}

After:

{F6367724}

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13263