mm: origin: Try using own number as the origin name

This will make it easier to select an origin for outgoing calls. Without this
change the name might be "0" which is not very expressive.

plugins/mm/calls-mm-origin.c

@@ -663,7 +663,14 @@ get_property (GObject      *object,
 static gchar *
 modem_get_name (MMModem *modem)
 {
-  gchar *name = NULL;
+  char *name = NULL;
+  const char * const *numbers = NULL;
+
+  numbers = mm_modem_get_own_numbers (modem);
+  if (numbers && g_strv_length ((char **) numbers) > 0) {
+    name = g_strdup (numbers[0]);
+    return name;
+  }
 
 #define try(prop)                               \
   name = mm_modem_dup_##prop (modem);           \