Qt (manage interface): fix warning: comma at end of enumerator list [-Wpedantic]

Change-Id: I728a50e47fd0d8eea77bc1cdebe2a155184ea953
Reviewed-on: https://code.wireshark.org/review/4456
Reviewed-by: Anders Broman <a.broman58@gmail.com>

ui/qt/manage_interfaces_dialog.cpp

@@ -65,13 +65,13 @@ enum
     col_l_show_,
     col_l_friendly_name_,
     col_l_local_name_,
-    col_l_comment_,
+    col_l_comment_
 };
 
 enum
 {
     col_r_show_,
-    col_r_host_dev_,
+    col_r_host_dev_
 };
 
 enum {