Fix build with Qt 4.6

git-svn-id: https://svn.code.sf.net/p/keepassx/code/trunk@350 b624d157-de02-0410-bad0-e51aec6abb33

src/Database.h

@@ -233,7 +233,7 @@ public:
 /*!
 This is the common base interface for databases. Every database class must implement this interface necessarily.
 */
-class IDatabase:public QObject{
+class IDatabase{
 public:
 	virtual ~IDatabase(){};