[FIX] component: do not validate props twice

it is not useful to do it in the component directive, especially since
it is done in the constructor, and the default props are not applied.

closes #379

tests/component/props_validation.test.ts

@@ -352,4 +352,22 @@ describe("default props", () => {
     expect(w.props.p).toBe(4);
     expect(fixture.innerHTML).toMatchSnapshot();
   });
+
+  test("can set default required boolean values", async () => {
+    class TestWidget extends Widget {
+      static props = ["p", "q"];
+      static defaultProps = { p: true, q: false };
+      static template = xml`<span><t t-if="props.p">hey</t><t t-if="!props.q">hey</t></span>`;
+    }
+
+    class App extends Widget {
+        static template = xml`<div><TestWidget/></div>`;
+        static components = { TestWidget };
+    }
+
+    const w = new App(env, {});
+    await w.mount(fixture);
+    expect(fixture.innerHTML).toBe('<div><span>heyhey</span></div>')
+  });
+
 });