tests/histedit-helpers.sh

dispatch: pass root path in ui.readconfig() as root of main repo

Since we are reading main (shared-source) repository config options, we
should pass root as that repository root only.

Differential Revision: https://phab.mercurial-scm.org/D9359

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
}