vtkWebApplication: match ParaView, change to LastStillRenderToMTime
The parameter LastStillRenderToStringMTime is renamed LastStillRenderToMTime to match ParaView changes.
CC: @sebastien.jourdain @danlipsa Easy fix for RemoteRenderer example.
A GitLab update will be applied on May 23, between 8am and 10am, EDT (UTC-04:00). This site may have intermittent delays during that time.
The parameter LastStillRenderToStringMTime is renamed LastStillRenderToMTime to match ParaView changes.
CC: @sebastien.jourdain @danlipsa Easy fix for RemoteRenderer example.