[UI] White labeling page active tab text color fix

[srivastava-diya]

Description

This PR fixes an issue where the active tab text color on the white-labeling page did not match the Meshery design theme. It updates the SASS styles so that the active state now reflects the correct primary text color.

Fixes Issue

Fixes #818

Notes for Reviewers

Please verify that:
-The active tab text color now uses the proper theme variable.

Screenshots

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After:

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[srivastava-diya]

hey @Namanv0509 this PR addresses issue #818 . Kindly check it out.

[leecalcote]

Thanks! We could improve upon this slightly by using a different background color for the active versus inactive tabs and/or different text color for the inactive/active tabs.

[srivastava-diya]

Thanks! We could improve upon this slightly by using a different background color for the active versus inactive tabs and/or different text color for the inactive/active tabs.

yes @leecalcote we can do this, the inactive tab color could be changed to white or any other suggestion that you would want to be implemented