shader/decode/*: Add missing newline to files lacking them

Keeps the shader code file endings consistent.

src/video_core/shader/decode/video.cpp

@@ -108,4 +108,4 @@ Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed,
     }
 }
 
-} // namespace VideoCommon::Shader
+} // namespace VideoCommon::Shader