[material-ui][Modal] Remove focus before set aria-hidden

[Zxilly]

Resolves: #43106

See https://github.com/mui/material-ui/issues/43106#issuecomment-2271044525 for details

• [x] I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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[Zxilly]

I don't think the current implementation is a good idea, but I haven't found an elegant way to solve this problem.

[ZeeshanTamboli]

Closing this PR. See https://github.com/mui/material-ui/issues/43106#issuecomment-2314809028