[FIX] qweb: properly handle xml comments

tests/qweb/__snapshots__/qweb.test.ts.snap

@@ -771,13 +771,15 @@ exports[`static templates empty div 1`] = `
 }"
 `;
 
-exports[`static templates ignore comments 1`] = `
+exports[`static templates properly handle comments 1`] = `
 "function anonymous(context,extra
 ) {
     var h = this.h;
     let c1 = [], p1 = {key:1};
     var vn1 = h('div', p1, c1);
-    c1.push({text: \`hello owl\`});
+    c1.push({text: \`hello \`});
+    c1.push(h('!', \` comment\`));
+    c1.push({text: \`owl\`});
     return vn1;
 }"
 `;

tests/qweb/qweb.test.ts

@@ -50,9 +50,9 @@ describe("static templates", () => {
     expect(renderToString(qweb, "test")).toBe("<div><span>word</span></div>");
   });
 
-  test("ignore comments", () => {
+  test("properly handle comments", () => {
     qweb.addTemplate("test", "<div>hello <!-- comment-->owl</div>");
-    expect(renderToString(qweb, "test")).toBe("<div>hello owl</div>");
+    expect(renderToString(qweb, "test")).toBe("<div>hello <!-- comment-->owl</div>");
   });
 });