DiskUsage: align tab focus mark with label.

Fixes #6905.

src/apps/diskusage/ControlsView.cpp

@@ -39,6 +39,7 @@ public:
 			float				IconWidth() const;
 
 	virtual	void				DrawLabel(BView* owner, BRect frame);
+	virtual	void				DrawFocusMark(BView* owner, BRect frame);
 
 private:
 			BBitmap*			fIcon;
@@ -95,6 +96,14 @@ VolumeTab::DrawLabel(BView* owner, BRect frame)
 }
 
 
+void
+VolumeTab::DrawFocusMark(BView* owner, BRect frame)
+{
+	frame.left += IconWidth();
+	BTab::DrawFocusMark(owner, frame);
+}
+
+
 VolumeTab::~VolumeTab()
 {
 	delete fIcon;