[dxvk] Do not dirty the pipeline when starting the render pass

Redundant, since the pipeline update happens outside of a render pass
anyway and thus does not record any Vulkan commands.

All other state should still be dirtied since we might use secondary
command buffers for render passes.

src/dxvk/dxvk_context.cpp

@@ -5297,7 +5297,6 @@ namespace dxvk {
 
       m_flags.set(
         DxvkContextFlag::GpRenderPassBound,
-        DxvkContextFlag::GpDirtyPipeline,
         DxvkContextFlag::GpDirtyPipelineState,
         DxvkContextFlag::GpDirtyVertexBuffers,
         DxvkContextFlag::GpDirtyIndexBuffer,