etc: Updated ufw firewall application preset with default GUI port

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3774

etc/firewall-ufw/README.md

@@ -4,19 +4,28 @@ Installation
 -----------
 **Please note:** When you installed syncthing using the official deb package, you can skip the copying.
 
-Copy the file `syncthing` to your ufw applications directory usually located at `/etc/ufw/applications.d/`. (root permissions required).
+Copy the file `syncthing` to your ufw applications directory usually located at `/etc/ufw/applications.d/` (root permissions required).
 
 In a terminal run
 ```
 sudo ufw app update syncthing
+sudo ufw app update syncthing-gui
 ```
-to load the preset.
+to load the presets.
 To allow the syncthing ports, run
 ```
 sudo ufw allow syncthing
 ```
-You can then verify the opened ports
+If you want to access the web gui from anywhere (not only from localhost), you can also allow the gui port.
+This is step is **not** necessary for a "normal" installation!
 ```
-sudo ufw status verbose
+sudo ufw allow syncthing-gui
 ```
 
+
+Verification
+----------
+You can verify the opened ports by running
+```
+sudo ufw status verbose
+```

etc/firewall-ufw/syncthing

@@ -2,3 +2,8 @@
 title=Syncthing
 description=Syncthing file synchronisation
 ports=22000/tcp|21027/udp
+
+[syncthing-gui]
+title=Syncthing-GUI
+description=Syncthing web gui
+ports=8384/tcp