Fix duplicate font family values in merged configuration

[Sridhar-C-25]

Fix duplicate font family values in merged configuration

This commit addresses an issue where duplicate font family values were being introduced into the merged configuration when merging with the Tailwind CSS config. Specifically, when the fontFamily property was set in the Tailwind CSS config with the value sans: ["Poppins", "monospace"], and then merged using the withMT function, duplicate entries such as ["Poppins", "Poppins","monospace","monospace"] were observed.

To resolve this issue, I updated the logic in the withMT function to properly merge font family values while avoiding duplicates.

[vercel]

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