Rearrange "Client ID" and "Endpoint" fields in demo app

[fungc-io]

authgear-sdk-flutter/example/lib/main.dart

Lines 299 to 318 in adf2aa1

	body: ListView(
	children: [
	Container(
	padding:
	const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
	child: TextFieldWithLabel(
	label: "Endpoint",
	hintText: "Enter Authegar endpoint",
	controller: _endpointController,
	),
	),
	Container(
	padding:
	const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
	child: TextFieldWithLabel(
	label: "Client ID",
	hintText: "Enter client ID",
	controller: _clientIDController,
	),
	),

Follow the convention of other example apps: "Client ID" input field should go above "Authgear Endpoint"