glab mr update --draft prepends draft: to any MR regardles of status

[frob]

Description
When I run:

glab mr update 13 --draft

And the issue title is: Draft: Add foo to bar
The new title is now: Draft: Draft: Add foo to bar

Running it again results in Draft: Draft: Draft: Add foo to bar

And on into infinity.

Expected Behavior vs Actual Behavior
I would expect it to either do nothing on something that is already marked Draft: or remove the draft status in the same manner notes do.

Possible Fix

Steps to Reproduce

1. run glab mr update 13 --draft
2. then glab mr update 13 --draft
3. again runglab mr update 13 --draft
4. Notice there are at least three Draft: markers before the MR.

Your Environment

• Version used (Run glab --version): glab version 1.22.0 (2022-01-10)
• Operating System and version: MacOS 12.5

[clemsbot]

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