When mailbox Offline screen is displayed notification is not correct

Steps to reproduce:

Install the mailbox and tap the icon to start it.

During the starting process, whilst the progress screen is displayed - switch the internet off (at router, modem etc)

Expected results:

• Mailbox 'notices' that there is no internet and disaplyed the 'Offline' screen.
• Notifications are also updated with this status and say something like: Mailbox is offline. Or similar.

Actual results:

• Mailbox notices that there is no internet connectivity, and it displays the offline screen correctly
• However, user notification is not updated correctly - instead it shows 'Mailbox is running'... (even though no linking with Briar was actually done yet)