Fix all header defines

src/qt/qvaluecombobox.h

@@ -2,8 +2,8 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef QVALUECOMBOBOX_H
-#define QVALUECOMBOBOX_H
+#ifndef BITCOIN_QT_QVALUECOMBOBOX_H
+#define BITCOIN_QT_QVALUECOMBOBOX_H
 
 #include <QComboBox>
 #include <QVariant>
@@ -34,4 +34,4 @@ private slots:
     void handleSelectionChanged(int idx);
 };
 
-#endif // QVALUECOMBOBOX_H
+#endif // BITCOIN_QT_QVALUECOMBOBOX_H