git-mv: allow submodules and fsmonitor to work together

It was reported that

   GIT_FSMONITOR_TEST=$PWD/t7519/fsmonitor-all ./t7411-submodule-config.sh

breaks as the fsmonitor data is out of sync with the state of the .gitmodules
file. Update is_staging_gitmodules_ok() so that it no longer tells
ie_match_stat() to ignore refreshing the fsmonitor data.

Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Ben Peart <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

submodule.c

@@ -65,8 +65,7 @@ int is_staging_gitmodules_ok(struct index_state *istate)
 	if ((pos >= 0) && (pos < istate->cache_nr)) {
 		struct stat st;
 		if (lstat(GITMODULES_FILE, &st) == 0 &&
-		    ie_match_stat(istate, istate->cache[pos], &st,
-				  CE_MATCH_IGNORE_FSMONITOR) & DATA_CHANGED)
+		    ie_match_stat(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
 			return 0;
 	}