ネットワークインストールの際のエラーを修正 (#72)

<!-- This is an auto-generated comment: release notes by OSS CodeRabbit
-->
### Summary by CodeRabbit

- Bug Fix: Improved the network installation process for multisite
setups in version 3.7.1. We've introduced a more precise method
`should_network_activate` to determine whether individual activation
should occur during network installation. This fix enhances the
reliability of the plugin's behavior across different network
configurations.
<!-- end of auto-generated comment: release notes by OSS CodeRabbit -->

README.md

@@ -70,6 +70,10 @@ Create a new [issue](https://github.com/kuno1/ga-communicator/issues) or send [p
 
 ## Changelog
 
+### 3.7.1
+
+* Fix setting error on individual activation under network install.
+
 ### 3.0.0
 
 * Add [Google Analytics Data API](https://developers.google.com/analytics/devguides/reporting/data/v1) support. [Core Reporting API](https://developers.google.com/analytics/devguides/reporting/core/v4?hl=ja) will be deprecated in 2023.

src/Kunoichi/GaCommunicator/Screen/Settings.php

@@ -93,7 +93,7 @@ public function network_admin_menu() {
 	public function admin_screen() {
 		wp_enqueue_style( 'ga-communicator-setting' );
 		wp_enqueue_script( 'ga-communicator-setting' );
-		if ( is_multisite() ) {
+		if ( $this->should_network_activate() ) {
 			$action = add_query_arg( [
 				'action' => 'update_' . $this->slug,
 			], network_admin_url( 'edit.php' ) );