fix: Fixes the host in the ansi bracket of adk web

localhost cannot always open Web UI, since we only bind 127.0.0.1.

PiperOrigin-RevId: 795484904

Author: Jacksunwei

src/google/adk/cli/cli_tools_click.py

@@ -749,7 +749,7 @@ async def _lifespan(app: FastAPI):
 +-----------------------------------------------------------------------------+
 | ADK Web Server started                                                      |
 |                                                                             |
-| For local testing, access at http://localhost:{port}.{" "*(29 - len(str(port)))}|
+| For local testing, access at http://{host}:{port}.{" "*(29 - len(str(port)))}|
 +-----------------------------------------------------------------------------+
 """,
         fg="green",