Merge bitcoin-core/gui#686: clang-tidy: Force checks for headers in src/qt

7b7cd11244 clang-tidy, qt: Force checks for headers in `src/qt` (Hennadii Stepanov)
69eacf2c5e clang-tidy, qt: Fix `modernize-use-default-member-init` in headers (Hennadii Stepanov)

Pull request description:

  This PR split from bitcoin/bitcoin#26705 and contains only changes in `src/qt`.

  Effectively, it fixes the clang-tidy's `modernize-use-default-member-init` errors, and forces clang-tidy checks for all headers in the `src/qt` directory.

ACKs for top commit:
  jarolrod:
    ACK 7b7cd11244

Tree-SHA512: 79525bb0f31ae7cad88c781e55091a21467c0485ddc1ed03ad62e051480fda3b3710619ea11af480437edba3c6e038f7c40edc6b373e3a37408c006d11b34686

src/qt/trafficgraphwidget.cpp

@@ -19,15 +19,10 @@
 #define XMARGIN                 10
 #define YMARGIN                 10
 
-TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
-    QWidget(parent),
-    timer(nullptr),
-    fMax(0.0f),
-    vSamplesIn(),
-    vSamplesOut(),
-    nLastBytesIn(0),
-    nLastBytesOut(0),
-    clientModel(nullptr)
+TrafficGraphWidget::TrafficGraphWidget(QWidget* parent)
+    : QWidget(parent),
+      vSamplesIn(),
+      vSamplesOut()
 {
     timer = new QTimer(this);
     connect(timer, &QTimer::timeout, this, &TrafficGraphWidget::updateRates);