#67 samples\wx\Paint.hs: window size minimal

[Henk-Jan van Tuyl]

Sample program Paint.hs does not show the drawing without manual resizing (at startup it does, for a fraction of a second).
Similarly, in samples\contrib\Camels.hs, only the buttons are displayed.

OS: Windows XP
GHC version: 7.6.3
wxWidgets version: 2.9.5
wxHaskell version: 0.90.1.0 (currently in Github repository)