Fix UI glitch

Signal/src/Loki/Settings/DeviceLinkingModal.swift

@@ -145,8 +145,8 @@ final class DeviceLinkingModal : Modal, DeviceLinkingSessionDelegate {
         dismiss(animated: true, completion: nil)
         let master = DeviceLink.Device(hexEncodedPublicKey: deviceLink.master.hexEncodedPublicKey, signature: linkingAuthorizationMessage.masterSignature)
         let signedDeviceLink = DeviceLink(between: master, and: deviceLink.slave)
-        LokiStorageAPI.addDeviceLink(signedDeviceLink).done { [weak self] in
-            self?.delegate?.handleDeviceLinkAuthorized(signedDeviceLink)
+        LokiStorageAPI.addDeviceLink(signedDeviceLink).done {
+            self.delegate?.handleDeviceLinkAuthorized(signedDeviceLink) // Intentionally capture self strongly
         }.catch { error in
             print("[Loki] Failed to add device link due to error: \(error).")
         }

Signal/src/Loki/Settings/DeviceLinksVC.swift

@@ -90,9 +90,7 @@ final class DeviceLinksVC : UIViewController, UITableViewDataSource, UITableView
     
     func handleDeviceLinkAuthorized(_ deviceLink: DeviceLink) {
         // The modal already dismisses itself
-        // FIXME: Somehow calling updateDeviceLinks() is unreliable here
-        deviceLinks.append(deviceLink)
-        updateUI()
+        updateDeviceLinks()
     }
     
     func handleDeviceLinkingModalDismissed() {