Fix accidental use of comma operator in wxMouseState

Replace an accidental comma with the semicolon, which is what should have been
used here since the beginning (even though comma actually did do the same
thing).

include/wx/mousestate.h

@@ -110,7 +110,7 @@ public:
     // these functions are mostly used by wxWidgets itself
     void SetX(wxCoord x) { m_x = x; }
     void SetY(wxCoord y) { m_y = y; }
-    void SetPosition(wxPoint pos) { m_x = pos.x, m_y = pos.y; }
+    void SetPosition(wxPoint pos) { m_x = pos.x; m_y = pos.y; }
 
     void SetLeftDown(bool down)   { m_leftDown = down; }
     void SetMiddleDown(bool down) { m_middleDown = down; }