Fix issue #4822, "svn diff --changelist ARG" broken in subdirectories. A follow-up to r1835234. * subversion/libsvn_wc/diff_local.c (svn_wc__diff7): Pass the correct anchor dir to the changelist filter. * subversion/tests/cmdline/changelist_tests.py (diff_with_changelists_subdir): New test. (test_list): Run it.