[Enhancement] Allow edit/drop action on the last commit

[un-pogaz]

It is currently not possible to edit/drop the last commit of the current branch. If you want to do so, you must take the one before it and launch an interactive rebase with one superfluous commit inside. It could ba very handy and from the five rebase action, the "Edit..." and "Drop.." actions are the only ones not availde for the last commit of the current branch.

[love-linger]

You can directly edit the HEAD commit with --amend option enabled.

There's no need to use interactive-rebase for HEAD commit

[love-linger]

I've pushed a new commit that supports to drop the HEAD commit by reset to it first parent. You can download the latest CI build from GitHub Action