wined3d: fix R8G8B8 texture upload

[Frank Richter]

According to MSDN, the memory layout of a texture format can be
derived from the format identifier by interpreting the first component
going into the most significant bit(s), the last into the least
significant bit(s). For WINED3DFMT_R8G8B8 this translates that the
byte order in memory is actually BGR. Thus upload as GL_BGR, not
GL_RGB.
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