[FIX] component: strict check of deep argument truth value

With this commit, we make sure that the `render` method was explicitely
called with the deep === true argument, instead of assuming that it is a
boolean.  This prevents errors when some unrelated value is given to the
render method. This could happen in some cases, such as

useBus(someBus, 'someevent', this.render)

In that case, the `useBus` code would simply call the this.render with a
customevent, which would be considered truthy before, and not anymore

src/component/component.ts

@@ -37,6 +37,6 @@ export class Component<Props = any, Env = any> {
   setup() {}
 
   render(deep: boolean = false) {
-    this.__owl__.render(deep);
+    this.__owl__.render(deep === true);
   }
 }