fix left border in session tabs
What does this MR do?
Fixes the missing left border in login session tabs, and removes double border in left tab.
Screenshots
Before:
After:
Does this MR meet the acceptance criteria?
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Changelog entry added - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Closes #24941 (closed)