fix bug registration done after link device cancelled

to reproduce before this fix:
- start link process of second device to first desktop device
- quit or refresh the second device window without updating any fields
- quit or refresh (a second time) the second device window without
updating any fields
- the second device window is now considered logged in (as a new device,
not linked with the first one)

This forces a full reset of the registration state when the registration
components are loaded, which are loaded only if the registration is not
done as required.

ts/components/session/RegistrationTabs.tsx

@@ -124,11 +124,12 @@ export class RegistrationTabs extends React.Component<{}, State> {
 
     this.accountManager = window.getAccountManager();
     // Clean status in case the app closed unexpectedly
-    window.textsecure.storage.remove('secondaryDeviceStatus');
   }
 
   public componentDidMount() {
     this.generateMnemonicAndKeyPair().ignore();
+    window.textsecure.storage.remove('secondaryDeviceStatus');
+    this.resetRegistration().ignore();
   }
 
   public render() {