OClCollMeshEngn:*KernelComplete: use WRITE_INVLDT during finalize()

Doing it this way enables us to get the mapBuffer() call working
during finalize. But we couldn't get the unmap call working. That
has to do with a bug in the Rusticl event waiting code.

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.h

@@ -60,8 +60,8 @@ private:
 		StagingBuffer& assemblyBuff, StagingBuffer& collationBuff,
 		collateKernelCbFn callback);
 
-	void compactKernelComplete();
-	void collateKernelComplete();
+	void compactKernelComplete(bool isFinalizing=false);
+	void collateKernelComplete(bool isFinalizing=false);
 	bool stop();
 
 public: