wined3d: Check for float texture formats correctly (try 2).

[Vitaly Budovski]

Move the checks for float texture formats into the correct location. 
This allows some Direct3D sample applications which check for any of the 
float formats together with D3DUSAGE_RENDERTARGET to start.

Added comment as suggested by Dmitry Timoshkov.
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  dlls/wined3d/directx.c |   32 +++++++++++++++-----------------
  1 files changed, 15 insertions(+), 17 deletions(-)
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