CloudToVTK functionObject broken.

Pstream::gatherList is called in CloudToVTK::writeData, which is called only on the master - thereby failing.

https://develop.openfoam.com/Development/OpenFOAM-plus/blob/975dc1d70217e8aaa4c0a9703da7283a21ec35bb/src/lagrangian/intermediate/submodels/CloudFunctionObjects/CloudToVTK/CloudToVTK.C#L117

Please find attached a patch to mend this.CloudToVTK.patch