Update inst/tests/S4.Rraw

Co-authored-by: Michael Chirico <[email protected]>

Author: ben-schwen

inst/tests/S4.Rraw

@@ -131,3 +131,4 @@ removeClass("CustomDurationClass")
 s4cl = setClass("s4cl", slots=list(x="integer"))
 DT = setalloccol(structure(list(a=new("s4cl", x=1L)), row.names=c(NA, -1L), class=c("data.table", "data.frame")))
 test(9, data.table(a=s4cl(x=1L)), DT)
+removeClass("s4cl")