Remove a somewhat redundant directory group mode

mico/mico.spec

@@ -196,7 +196,7 @@ AutoReqProv:  no
 
     #   generate files listing
     %{l_rpmtool} files -v -ofiles -r$RPM_BUILD_ROOT %{l_files_std} \
-        '%attr(755,%{l_rusr},%{l_rgrp}) %{l_prefix}/var/mico'
+        '%attr(755,%{l_rusr},%{l_mgrp}) %{l_prefix}/var/mico'
 
 %files -f files