fix(tauri) embedded-server edge case with config host

[lucasfernog]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

• It's submitted to the dev branch and not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• Any necessary documentation has been added or updated in the docs (for faster update click on "Suggest an edit on GitHub" at bottom of page) or explained in the PR's description.

If adding a new feature, the PR's description includes:

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Other information:

There's an edge case for how the webview and our embeddedServer loads its URLs.
When the config -> host is set to something like localhost or 127.0.0.1 (without http:// protocol), the server starts correctly, but the webview doesn't. We have to explicitely set the http protocol on the webview, but not on the embedded web server.

So, with this PR, we add the protocol for the webview load URL if its not there, and we always remove it from the config host. With this approach, the embedded web server MUST be served locally.

There are some other changes because I ran cargofmt.

[nothingismagick]

I am approving this to get it into dev so I can build our test/app