Gui: fix default color of report view messages in preferences

src/Gui/DlgReportViewImp.cpp

@@ -42,6 +42,7 @@ DlgReportViewImp::DlgReportViewImp( QWidget* parent )
   , ui(new Ui_DlgReportView)
 {
     ui->setupUi(this);
+    ui->colorText->setColor(qApp->palette().windowText().color());
 }
 
 /**

src/Gui/ReportView.cpp

@@ -526,7 +526,7 @@ bool ReportOutput::event(QEvent* event)
 void ReportOutput::changeEvent(QEvent *ev)
 {
     if (ev->type() == QEvent::StyleChange) {
-        QPalette pal = palette();
+        QPalette pal = qApp->palette();
         QColor color = pal.windowText().color();
         unsigned int text = (color.red() << 24) | (color.green() << 16) | (color.blue() << 8);
         auto value = static_cast<unsigned long>(text);