add missing addStatusObserver to pendingCommandRecovery

[marionbarker]

See Loop Issue LoopKit/Loop#2118 for description of the problem.

By comparing the OmniBLE DashUICoordinator.swift file and the OmniKit OmnipodUICoordinator.swift file, I observed a line missing in the OmniKit version.

By adding that line and repeating the Uncertain Comms test for Eros, I was able to demonstrate immediate recovery for Eros similar to that seen when testing with the DASH rPi for OmniBLE.

In other words:

• Stimulate an uncertain comms using Eros pod, Medtronic Rileylink and Faraday bag
• With this PR in place, when the Rileylink is removed from the Faraday bag, the Comms restored screen appeared immediately

[ps2]

Thanks!