fix: update class name to fix message input margin

[domw30]

What does this do?

• fixes the margin for the compose a message input.

Why are we making this change?

• this change is to fix the margin to what is currently in production. This was not an intended design change, therefore the fix is required.

How do I test this?

• open the app (not in full screen) and check the message input has equal margins as per screenshots below.

Key decisions and Risk Assessment:

Things to consider:

1. How will this affect security?
2. How will this affect performance?
3. Does this change any APIs?

Before:

After:

[ratik21]

thanks for fixing