video_core: Remove unnecessary enum class casting in logging messages

fmt now automatically prints the numeric value of an enum class member by default, so we don't need to use casts any more.

Reduces the line noise in our code a bit.

Co-Authored-By: LC <712067+lioncash@users.noreply.github.com>

src/video_core/swrasterizer/framebuffer.cpp

@@ -297,7 +297,7 @@ Common::Vec4<u8> EvaluateBlendEquation(const Common::Vec4<u8>& src,
         break;
 
     default:
-        LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation 0x{:x}", static_cast<u8>(equation));
+        LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation 0x{:x}", equation);
         UNIMPLEMENTED();
     }