[d3d11] Downgraded input layout message to debug

Specifying a vertex attribute that is not actually consumed by
the shader is perfectly legal and may improve performance if
the number of state changes can be reduced.

src/d3d11/d3d11_device.cpp

@@ -684,7 +684,7 @@ namespace dxvk {
           pInputElementDescs[i].SemanticIndex);
         
         if (entry == nullptr) {
-          Logger::warn(str::format(
+          Logger::debug(str::format(
             "D3D11Device: No such vertex shader semantic: ",
             pInputElementDescs[i].SemanticName,
             pInputElementDescs[i].SemanticIndex));