[bug] save button in post is not disabled on loading

[soham2k06]

'Save' button in post creating or editing is not disabled while loading.

It is causing a lot of fetch request while loading too.

To reproduce the issue

1. Go to create or edit post
2. Open network tab on dev tools to notice fetch requests.
3. Click 'Save' button continuously

[osama-22]

Resolved in - PR-270