Fixed forest R / C++ interface bug

Author: andrewherren

R/forest.R

@@ -785,7 +785,7 @@ Forest <- R6::R6Class(
         #' Return constant leaf status of trees in a `Forest` object
         #' @return `TRUE` if leaves are constant, `FALSE` otherwise
         is_constant_leaf = function() {
-            return(is_leaf_constant_forest_container_cpp(self$forest_ptr))
+            return(is_leaf_constant_active_forest_cpp(self$forest_ptr))
         }, 
 
         #' @description