isisd: save metric-style narrow

isisd defaults to wide metric style. So if narrow metric style is
configured, a matching setting should be written to the configuration,
allowing a narrow metric-style setting to be saved.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/isisd/isisd.c b/isisd/isisd.c
index e8e3d9f..47675f0 100644
--- a/isisd/isisd.c
+++ b/isisd/isisd.c
@@ -2857,6 +2857,11 @@
 	      vty_out (vty, " metric-style transition%s", VTY_NEWLINE);
 	    write++;
 	  }
+	else
+	  {
+	    vty_out (vty, " metric-style narrow%s", VTY_NEWLINE);
+	    write++;
+	  }
 	/* ISIS - overload-bit */
 	if (area->overload_bit)
 	  {