Fix JavaWizardWidget compilation without PCH

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

launcher/ui/widgets/JavaWizardWidget.cpp

@@ -1,5 +1,6 @@
 #include "JavaWizardWidget.h"
 
+#include <QCheckBox>
 #include <QFileDialog>
 #include <QGroupBox>
 #include <QLabel>
@@ -556,4 +557,4 @@ void JavaWizardWidget::onSpinBoxValueChanged(int)
 JavaWizardWidget::~JavaWizardWidget()
 {
     delete m_verticalSpacer;
-};
+};

launcher/ui/widgets/JavaWizardWidget.h

@@ -6,6 +6,7 @@
 #include <java/JavaChecker.h>
 #include <QIcon>
 
+class QCheckBox;
 class QLineEdit;
 class VersionSelectWidget;
 class QSpinBox;