Re-enable microtask loop

Must have gotten disabled in a merge?

src/browser/page.zig

@@ -115,7 +115,7 @@ pub const Page = struct {
         // load polyfills
         try polyfill.load(self.arena, self.scope);
 
-        // _ = try session.browser.app.loop.timeout(1 * std.time.ns_per_ms, &self.microtask_node);
+        _ = try session.browser.app.loop.timeout(1 * std.time.ns_per_ms, &self.microtask_node);
     }
 
     fn microtaskCallback(node: *Loop.CallbackNode, repeat_delay: *?u63) void {