Fixed a wrong condition check.

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 if (!m_IsOffscreenCamera)
                     colorRT = m_CurrCameraColorRT;
 
-                if (m_RequireDepthTexture)
+                if (m_DepthRenderBuffer)
                     depthRT = m_DepthRT;
             }