renderer: use a render pass for render modif in client render

fixes #8918

src/render/OpenGL.hpp

@@ -110,7 +110,6 @@ struct SMonitorRenderData {
 
 struct SCurrentRenderData {
     PHLMONITORREF       pMonitor;
-    PHLWORKSPACE        pWorkspace = nullptr;
     Mat3x3              projection;
     Mat3x3              savedProjection;
     Mat3x3              monitorProjection;