Correctly set the cli Group in Quart

This was mistakenly set to Flask's in the Flask Sansio Scaffold, hence
Quart needs to override it to its own.

src/quart/app.py

@@ -38,6 +38,7 @@
 from werkzeug.wrappers import Response as WerkzeugResponse
 
 from .asgi import ASGIHTTPConnection, ASGILifespan, ASGIWebsocketConnection
+from .cli import AppGroup
 from .ctx import (
     _AppCtxGlobals,
     AppContext,
@@ -315,6 +316,9 @@ def __init__(
 
         self.template_context_processors[None] = [_default_template_ctx_processor]
 
+        self.cli = AppGroup()  # type: ignore[assignment]
+        self.cli.name = self.name
+
         if self.has_static_folder:
             assert (
                 bool(static_host) == host_matching

src/quart/blueprints.py

@@ -56,6 +56,7 @@ def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
         super().__init__(*args, **kwargs)
 
         self.cli = AppGroup()  # type: ignore[assignment]
+        self.cli.name = self.name
 
         self.after_websocket_funcs: t.Dict[
             AppOrBlueprintKey, t.List[AfterWebsocketCallable]