Autofocus the commit message text field when calling the command

[khalyomede]

Description

Great extension, I would only miss this feature: to be able to type a message right after calling the command from the command palette.

Reproduce

1. Focus the commit text field with the mouse
2. Command + Shift + P
3. Type prefix
4. Type Enter
5. The commit text field is filled, but the text field is not focused anymore

Expected behavior

The commit text field is focused after calling the command so we can go fast and type the commit message.

[GeiOoo]

PR is closed but not merged... Id really appreciate this feature

[j0be]

I added this to PR #27 as well