Fix: Edit post scroll for max characters

[mitulagr2]

Summary

Once the error message has appeared at the top of the screen, you are now able to scroll down to the end of the post to edit/remove characters.

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-56679
Fixes mattermost/mattermost#26112

Device Information

This PR was tested on:

• Google Pixel 9, Android 15

Release Note

NONE

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[mitulagr2]

/check-cla

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