richview: removed DoAllocateWindowHandle() which caused a memory leak.
richview: removed DoAllocateWindowHandle() which caused a memory leak.

The above mentioned method called CreateWnd() twice, thus causing a memory
leak. Now CreateWnd() is simply called once in the constructor.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI