QMetaType: remove useless public: access specifier

We're already in the public section.

Change-Id: I0d3a04f71574110b7f68edf978ccde9586b18759
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>

src/corelib/kernel/qmetatype.h

@@ -490,8 +490,6 @@ public:
     }
     friend bool operator!=(QMetaType a, QMetaType b) { return !(a == b); }
 
-public:
-
 #ifndef QT_NO_DEBUG_STREAM
     bool debugStream(QDebug& dbg, const void *rhs);
     bool hasRegisteredDebugStreamOperator() const;