x11drv: fix programatic minimisation of managed windows

[Troy Rollo]

Fixes the following problems when minimising managed windows:

1. If the window was invisible and SW_SHOWMINIMIZED is used, the window 
remains invisible.
2. When the window is restored it is restored to size 32x32 in the bottom left 
of the screen.

ChangeLog:
	x11drv: fix programatic minimisation of managed windows

-- 
Troy Rollo - wine at troy.rollo.name
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