Description:
When setting up a remote service with WebDAV, if the user keeps the leading "https://" in the host URL, the service will fail to connect as it only saves "https" as the host.

Steps to Reproduce:
1. File > Open Remote...
2. Manage services > Add service
3. Fill in details for a WebDAV connection, keeping the "https://" at the beginning of the URL for the "Host" field (and using "Secure connection" for this example)
4. Click "OK": it fails to connect
5. Click "Manage services > Edit service"


Actual Results:
The settings:
- use "https" as the host
- use the port 80 even if "secure connection" was used
- have prepended "//<host.url>/:443/" to the root value

Expected Results:
Host URLs are supported regardless of if they have the leading "https://" or not.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
To connect to my NextCloud, I use the following settings:

- Type: WebDAV
- Host: nextcloud.instance.url (no HTTP(S) at the beginning)
- Secure connection ticked (which changes the port to 443)
- Label: label of your choice
- Root: remote.php/dav/files/USERNAME/

Earliest version tested:

Version: 7.0.6.2
Build ID: 00(Build:2)
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Ubuntu package version: 1:7.0.6-0ubuntu0.18.04.1_lo1
Calc: threaded

But issue still present in:

Version: 7.3.0.2 / LibreOffice Community
Build ID: f1c9017ac60ecca268da7b1cf147b10e244b9b21
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded