fix: block overflow when editing comment

[ihor-romaniuk]

Description

This merge request contains a fix for the comment edit block width at small screen resolutions for course Discussions pages or discussion sidebar in MFE Learning.

Related PR

• quince branch: https://github.com/openedx/frontend-app-discussions/pull/705
• master branch: https://github.com/openedx/frontend-app-discussions/pull/706

Screenshots:

Before	After

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