Backspace in a line's leading blanks goes back to the previous indent stop

helix's delete_char_backward dedents: when everything before the cursor on its
line is blank, it deletes back to the previous multiple of the indent width,
a whole unit when already on one (a tab before the cursor still goes alone).
pardes deleted one space, so O<backspace> under an indented line left three
of four, which is where helix-golf's function_into_class ended up.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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