fix: Added disabled prop in save button

[soham2k06]

File: EventTypeSingleLayout.tsx If no input field is changed then 'save' button will be disabled.

What does this PR do?

If no input field is changed then 'save' button will be disabled.

Fixes # (issue)

It fixes the bug where used could click save button even if no field is updated in event. It reduces fetch requests.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Mandatory Tasks

• [x] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

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[Udit-takkar]

This PR https://github.com/calcom/cal.com/pull/13292#pullrequestreview-1875797381 should fix the issue