SHERLOCK: Remove empty destructor for WidgetFiles.

WidgetBase already has a virtual destructor, thus there is no need to make
WidgetFiles have an empty virtual destructor around. This also prevents g++
for Dreamcast from failing due to an internal compiler error.

engines/sherlock/tattoo/widget_files.h

@@ -67,7 +67,6 @@ class WidgetFiles: public WidgetBase, public SaveManager {
 	virtual Common::Rect getScrollBarBounds() const;
 public:
 	WidgetFiles(SherlockEngine *vm, const Common::String &target);
-	virtual ~WidgetFiles() {}
 
 	/**
 	 * Prompt the user whether to quit