tests/histedit-helpers.sh

summary: migrate `opts` to native kwargs

This has the added benefit of unconfusing PyCharm- it thought `opts` in the
nested functions were str based for some reason.

fixbundle() {
    grep -v 'saving bundle' | grep -v 'saved backup' | \
        grep -v added | grep -v adding | \
        grep -v "unable to find 'e' for patching" | \
        grep -v "e: No such file or directory" | \
    cat
}