Fix keep WiFi connection after closing WebUi if it was established beforehand

[Tawank]

I am switching beetwen the Files/WebUI and the JS interpreter.
Every time even if the connection was established before entering the Files/WebUI it disconnects after I exit the WebUI.
This PR fixes this, of course if the wifi connection is created during the WebUI initiation, it will still disconnect after closing the WebUI, as expected.

Proposed Changes

• fixed keep WiFi connection after closing WebUi if it was established beforehand
• removed unnesesary wifi connections functions before calling startWebUi() as they duplicated the code already present in the startWebUi() function

Types of Changes

Bugfix

Verification

You can start the WebUI with a connected WiFi, and the connection will remain active.
If you start the WebUI with no WiFi connection, it will disconnect from WiFi after closing the WebUI.

User-Facing Change

Fix to keep WiFi connection after closing WebUi if it was established beforehand