remove absolute url

[benderl]

Description:

The "Manage File System" page uses an absolute URI including wifi ip to switch between flash and sd card. If your device uses an ethernet port and has wifi turned off or not configured, the link target resolves to http://0.0.0.0/ufsd?.

This PR changes the target to only use a relative URI without ip. So the browser will use the ip or hostname of the current page.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.7
• I accept the CLA.

I have only a ESP32 dev board and cannot test on ESP8266 hardware, but the change is minimal and should also be valid for this platform.

[Jason2866]

@bend @s-hadinger imho it would be better to fix the IP 0.0.0.0 to the one which is used and valid
Dont know the side effects (breaking change?) by this PR

[benderl]

No, it's not breaking anything. All other links i found in the modified file do not use an absolute URI with protocol and host (hostname or ip).

If you really would want to use a host in the URI, things become quite complicated. What if there are multiple network devices? You would have to parse the request, to find the right host currently used in this session. But that is a lot of work for something, that is not needed.

[s-hadinger]

In principle I agree that not specifying the IP is better. Unless it brakes something (which I don't see why it would), I approve.

[Jason2866]

Let us see if issues arrives ;-)