Only update logindefs when needed

src/freedombone-utils-setup

@@ -455,7 +455,8 @@ function remove_management_engine_interface {
 }
 
 function set_login_umask {
-    if ! grep -q 'UMASK\t\t077' /etc/login.defs; then
+    logindefs_umask=$(cat /etc/login.defs | grep UMASK | grep -v '#')
+    if [[ "$logindefs_umask" != *'077' ]]; then
         sed -i 's|UMASK\t.*|UMASK\t\t077|g' /etc/login.defs
     fi
 }