- Removed unnecessary Min() for R8G8B8A8_SNORM
  (see https://www.khronos.org/registry/vulkan/specs/1.1/html/vkspec.html#fundamentals-fixedfpconv)​
- Removed redundant parenthesis.
- Used hexadecimals for the normalization factor (to match mask).
- Used uppercase for hexadecimals.
- Used decimal point for floating-point constants.

Bug: b/159561781
Change-Id: I4eed4be3ec9b58bb43652de396bd3a34813eb283
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46010
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>