message: Qt: Fixed behaviour of some buttons
  Several buttons had functors connected to wrong signals,
  which resulted in incosistent UI behaviour.
diff: @@ -176,10 +176,10 @@ PerformanceCounterSelection::PerformanceCounterSelection(ICaptureContext &ctx,
  }
  });
  - connect(ui->save, &QPushButton::pressed, this, &PerformanceCounterSelection::Save);
  - connect(ui->load, &QPushButton::pressed, this, &PerformanceCounterSelection::Load);
  - connect(ui->sampleCounters, &QPushButton::pressed, this, &PerformanceCounterSelection::accept);
  - connect(ui->cancel, &QPushButton::pressed, this, &PerformanceCounterSelection::reject);
  + connect(ui->save, &QPushButton::clicked, this, &PerformanceCounterSelection::Save);
  + connect(ui->load, &QPushButton::clicked, this, &PerformanceCounterSelection::Load);
  + connect(ui->sampleCounters, &QPushButton::clicked, this, &PerformanceCounterSelection::accept);
  + connect(ui->cancel, &QPushButton::clicked, this, &PerformanceCounterSelection::reject);
  connect(ui->counterTree, &RDTreeWidget::itemChanged, [this](RDTreeWidgetItem *item, int) -> void {
  const QVariant d = item->data(0, CounterIdRole);
  