use Second Local Key name from hasOneThrough Relation instead getForeignKey from Pivot Table

Author: RF1705

src/EloquentDataTable.php

@@ -195,7 +195,7 @@ protected function joinEagerLoadedColumn($relation, $relationColumn)
 
                     $related = $model->getRelated();
                     $table   = $related->getTable();
-                    $tablePK = $related->getForeignKey();
+                    $tablePK = $model->getSecondLocalKeyName();
                     $foreign = $pivot . '.' . $tablePK;
                     $other   = $related->getQualifiedKeyName();