`glab mr create` always try to merge on master

[peauc]

Describe the feature or problem you'd like to solve
When creating a Merge Request with glab, no matter what base my branched is based on, the default branch for the merge request will be master. I use the option -b to specify the target branch, but it is a bit frustrating as I use long branch names.

Propose a Solution
I would like that glab mr create use the current branch's base by default as a merge target.

Additional context
I could take a look myself at the resolution if the idea seems good and ressources are thin. Thank you for your work on this nice project :)

[frob]

I would prefer the default branch be the default branch that mr create users. This would parallel the UI.

[clemsbot]

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