Fix WI desc alignment in Edit mode when the :work_items_mvc is off

What does this MR do and why?

Fixes the work item description alignment when the :work_items_mvc is off.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. In rails console disable the work_items_mvc flag

   Feature.disable(:work_items_mvc)

2. Visit any work item -> task/objective/Key Result
3. Click on the edit button of the description , and check the alignment

Now repeat the same process with the flag turned on , verify that the it is the same.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.