fix: fix add gender type

[kavanpancholi]

This PR adds default value in the type field in the default gender selection form and adds validation of gender type selections.

Fixes Issue: #4381

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[kavanpancholi]

Hi @asbiin I think this PR will help to resolve a bug in "Add new gender type" in Monica Settings -> Personalization.
Can you look at this when you get some time?
Thanks

[asbiin]

Thank you @kavanpancholi
See my comment below.

[kavanpancholi]

Hi @asbiin, I've made changes as per your comment.
Now it picks the default gender from settings instead of the static value.
Also, There was an error in default gender validation which I've resolved in a separate commit.

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