message: Show variable context menu for constants panel as well
diff: @@ -985,6 +985,9 @@ void ShaderViewer::debugShader(const ShaderBindpointMapping *bind, const ShaderR
  ui->watch->setContextMenuPolicy(Qt::CustomContextMenu);
  QObject::connect(ui->watch, &RDTreeWidget::customContextMenuRequested, this,
  &ShaderViewer::variables_contextMenu);
  + ui->constants->setContextMenuPolicy(Qt::CustomContextMenu);
  + QObject::connect(ui->constants, &RDTreeWidget::customContextMenuRequested, this,
  + &ShaderViewer::variables_contextMenu);
  ui->debugVars->setContextMenuPolicy(Qt::CustomContextMenu);
  QObject::connect(ui->debugVars, &RDTreeWidget::customContextMenuRequested, this,
  &ShaderViewer::variables_contextMenu);
  