Add localStorage methods for currentProtocol

[tboeckmann]

Is your feature request related to a problem? Please describe.
The currentProtocol is hard coded for now in the inbox view.

public currentProtocol: string = "ethereum"

It should be a LocalStorageProtocolService.getCurrentProtocol() lookup to handle additional protocols going forwards.

The lookup should be added to:

  async ngOnInit(): Promise<void> {
    this.setFetchingMessagesState(true)

    try {
      this.currentAccount = await this.localStorageAccountService.getCurrentAccount()
      this.currentNetwork = this.localStorageServerService.getCurrentNetwork()
      // <<< Insert here
      this.getServerSettings()
    } catch (error) {
    ...
  }

Does this need to be async?

This is also used by the child view components, compose, message