Handle the edge case where camera restrictions change while the app runs

Author: mattrubin

Authenticator/Source/TokenScannerViewController.swift

@@ -143,6 +143,9 @@ class TokenScannerViewController: UIViewController, QRScannerDelegate {
             showMissingAccessMessage()
         case .restricted:
             // There's nothing we can do if camera access is restricted.
+            // This should only ever be reached is camera restrictions are changed while the app is running, because if
+            // the app is launched with restrictions already enabled, the deviceCanScan check will retrun false.
+            dispatchAction(.beginManualTokenEntry)
             break
         }
     }