modem-helpers: act given in COPS=? may have more than one digit

The new 5GNR related values are >= 10, so don't expect one single
digit (\d), expect one or more (\d+).

src/mm-modem-helpers.c

@@ -1228,7 +1228,7 @@ mm_3gpp_parse_cops_test_response (const gchar     *reply,
      *       +COPS: (2,"","T-Mobile","31026",0),(1,"AT&T","AT&T","310410"),0)
      */
 
-    r = g_regex_new ("\\((\\d),\"([^\"\\)]*)\",([^,\\)]*),([^,\\)]*)[\\)]?,(\\d)\\)", G_REGEX_UNGREEDY, 0, NULL);
+    r = g_regex_new ("\\((\\d),\"([^\"\\)]*)\",([^,\\)]*),([^,\\)]*)[\\)]?,(\\d+)\\)", G_REGEX_UNGREEDY, 0, NULL);
     g_assert (r);
 
     /* If we didn't get any hits, try the pre-UMTS format match */