[IMP] qweb: turn handlers into function expressions only

For the sake of consistency with vanilla JS, and to allow some things
that were previously not possible.

src/component/component_node.ts

@@ -93,7 +93,7 @@ export class ComponentNode<T extends typeof Component = any> implements VNode<Co
     this.level = parent ? parent.level + 1 : 0;
     applyDefaultProps(props, C);
     this.component = new C(props, app.env, this) as any;
-    this.renderFn = app.getTemplate(C.template).bind(null, this.component, this);
+    this.renderFn = app.getTemplate(C.template).bind(this.component, this.component, this);
     if (C.style) {
       applyStyles(C);
     }