Fix memory leak in payment transfer fragment.

app/src/main/java/org/thoughtcrime/securesms/payments/preferences/transfer/PaymentsTransferFragment.java

@@ -92,7 +92,7 @@ public final class PaymentsTransferFragment extends LoggingFragment {
   }
 
   private void scanQrCode() {
-    Permissions.with(requireActivity())
+    Permissions.with(this)
                .request(Manifest.permission.CAMERA)
                .ifNecessary()
                .withRationaleDialog(getString(R.string.PaymentsTransferFragment__to_scan_a_qr_code_signal_needs), R.drawable.ic_camera_24)
@@ -110,4 +110,10 @@ public final class PaymentsTransferFragment extends LoggingFragment {
                    .setNegativeButton(android.R.string.cancel, null)
                    .show();
   }
+
+  @Override
+  @SuppressWarnings("deprecation")
+  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+    Permissions.onRequestPermissionsResult(this, requestCode, permissions, grantResults);
+  }
 }