code: public boolean onBackPressed() {
          if (passwordlessInputCodeLayout != null) {
              Log.d(TAG, "Removing the Code Input Form, going back to the Social/Passwordless Form.");
              if (socialLayout != null) {
                  socialLayout.setVisibility(VISIBLE);
              }
              if (orSeparatorMessage != null) {
                  orSeparatorMessage.setVisibility(VISIBLE);
              }
              removeView(passwordlessInputCodeLayout);
              addView(passwordlessRequestCodeLayout);
              passwordlessInputCodeLayout = null;
              lockWidget.resetHeaderTitle();
              return true;
          }
          return false;
      }
docs: Triggers the back action on the form.
  
  @return true if it was handled, false otherwise