wgl: Fix mingw32 build.

This was missed in commit fcf438e9e03f6e75bca4a49ad372fe7c4b1abbf8.
diff --git a/src/gallium/state_trackers/wgl/stw_pixelformat.c b/src/gallium/state_trackers/wgl/stw_pixelformat.c
index f8edc56..bc28f31 100644
--- a/src/gallium/state_trackers/wgl/stw_pixelformat.c
+++ b/src/gallium/state_trackers/wgl/stw_pixelformat.c
@@ -271,14 +271,12 @@
    memset(visual, 0, sizeof *visual);
    _mesa_initialize_visual(
       visual,
-      (pfi->pfd.iPixelType == PFD_TYPE_RGBA) ? GL_TRUE : GL_FALSE,
       (pfi->pfd.dwFlags & PFD_DOUBLEBUFFER) ? GL_TRUE : GL_FALSE,
       (pfi->pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE,
       pfi->pfd.cRedBits,
       pfi->pfd.cGreenBits,
       pfi->pfd.cBlueBits,
       pfi->pfd.cAlphaBits,
-      (pfi->pfd.iPixelType == PFD_TYPE_COLORINDEX) ? pfi->pfd.cColorBits : 0,
       pfi->pfd.cDepthBits,
       pfi->pfd.cStencilBits,
       pfi->pfd.cAccumRedBits,