Fixes the `vim::ScrollUp/Down` commands when a normal-mode vim or helix
selection exists.

Pretty straightforward: make the `scroll_editor` function aware of the
current vim/helix mode, and only expand the selection if a visual mode
is active.

Closes #47022

Release Notes:

- Fixed bug causing normal-mode vim/helix selections to get expanded
during `vim::Scroll` commands

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Co-authored-by: dino <dinojoaocosta@gmail.com>