uint uniforms were failing because of a missing condition.
This only affected uint scalars, uint vectors were unaffected.

Change-Id: Ia2338a683f1e6f5f9b6944aae72e2dbec70a8ef2
Reviewed-on: https://swiftshader-review.googlesource.com/3963Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>