fix for ticket #2626 breaks completion in some cases

[mnk]

I refer to the part in lib/widget/input_complete.c.

If - for example - there's a dir with spaces in its name, that has subdirs, completion for the dir is correct, but to reach the subdirs with completion, you need to manually unquote the string.

That likely means that this quoting should be done in a different place, though I can't yet figure out where.