PipeAst: Take the expr instead of passing the whole call

Author: hexaredecimal

src/main/java/org/piccode/ast/PipeAst.java

@@ -73,7 +73,7 @@ public PiccodeValue execute(Integer frame) {
 
 			var call = (CallAst) rhs;
 			call.nodes.forEach(node -> newArgs.addLast(node));
-			var _call = new CallAst(call, newArgs);
+			var _call = new CallAst(call.expr, newArgs);
 			return _call.execute(frame);
 		});
 	}