[WINED3D] Fix mipmap level count

[Ivan Gyurdiev]

The current logic stops counting mipmapping level when any dimension 
reaches size 1.
MSDN specifies that mipmapping should stop when we reach 1x1 size [ i.e. 
when all dimensions reach 1 ].

This patch fixes an issue with MandelbrotSet.exe demo 
(http://www.humus.ca/index.php?page=3D&&start=32).
Together with the D3DSIO_TEX patch, they are almost sufficient to get 
the demo working properly.



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