Fix SIGSEGV encountered on macOS

When attempting to close the frame grabber from a separate thread,
the application would crash due to a SIGSEGV.

desktop/src/main/java/bisq/desktop/main/account/content/notifications/qr/ImageCaptureReader.java

@@ -120,17 +120,17 @@ public void run() {
  } catch (InterruptedException e) {
  Thread.currentThread().interrupt();
  } finally {
+ try {
+ frameGrabber.close();
+ } catch (FrameGrabber.Exception ignored) {
+ // Don't care if this throws an exception at this point
+ }
  close();
  }
  }
 
  @Override
  public void close() {
  isRunning = false;
- try {
- frameGrabber.close();
- } catch (FrameGrabber.Exception ignored) {
- // Don't care if this throws an exception at this point
- }
  }
 }