histedit: fix keep during --continue
The --keep option was being serialized to the state file, but it wasn't actually
being used when running a histedit --continue. This fixes that.
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"
}