bookmarks: properly invalidate volatile sets when writing bookmarks
This corrects a regression introduced during the 3.7 cycle, but which
went undetected due to the surviving-but-deprecated write() method on
bmstore.
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
}