Show pointing hand cursor when hovering spaceinfo bar

Summary:
This improves the discoverability of the diskspace menu, a feature
otherwise almost impossible to find.

Reviewers: gregormi, emmanuelp

Differential Revision: https://phabricator.kde.org/D4873

src/statusbar/statusbarspaceinfo.cpp

@@ -33,6 +33,7 @@ StatusBarSpaceInfo::StatusBarSpaceInfo(QWidget* parent) :
     KCapacityBar(KCapacityBar::DrawTextInline, parent),
     m_observer(0)
 {
+    setCursor(Qt::PointingHandCursor);
 }
 
 StatusBarSpaceInfo::~StatusBarSpaceInfo()