QL: regenerate TreeSitter.ql

ql/src/codeql_ql/ast/internal/TreeSitter.qll

@@ -123,11 +123,6 @@ module Generated {
     override AstNode getAFieldOrChild() { as_expr_child(this, _, result) }
   }
 
-  AsExpr childThing(int i, AstNode child) {
-    result.getChild(i) = child and
-    i != 0
-  }
-
   class AsExprs extends @as_exprs, AstNode {
     override string getAPrimaryQlClass() { result = "AsExprs" }