Correctly init _colorGroup

src/QGCPalette.cc

@@ -47,7 +47,8 @@ QColor QGCPalette::_window[QGCPalette::_cColorGroups];
 QColor QGCPalette::_windowText[QGCPalette::_cColorGroups];
 
 QGCPalette::QGCPalette(QObject* parent) :
-    QObject(parent)
+    QObject(parent),
+    _colorGroup(Active)
 {
     if (!_paletteLoaded) {
         _paletteLoaded = true;

src/QGCPalette.h

@@ -55,7 +55,7 @@ class QGCPalette : public QObject
 
 public:
     enum ColorGroup {
-        Disabled,
+        Disabled = 0,
         Active,
         Inactive
     };