Multisite: Use "Network Activate" button on network plugin install screen.

The "Activate" button label should be "Network Activate" after clicking the "Install Now" button in Network Admin > Plugins > Add Plugin.

Props pmbaldha, shailu25, rollybueno.
Fixes #63954.


git-svn-id: https://develop.svn.wordpress.org/trunk@61016 602fd350-edb4-49c9-b593-d223f7449a82

Author: aaronjorbin

src/js/_enqueues/wp/updates.js

@@ -965,7 +965,7 @@
 		wp.a11y.speak( __( 'Plugin dependencies check completed successfully.' ) );
 		$document.trigger( 'wp-check-plugin-dependencies-success', response );
 
-		if ( 'plugins-network' === pagenow ) {
+		if ( 'plugins-network' === pagenow || 'plugin-install-network' === pagenow ) {
 			buttonText = _x( 'Network Activate', 'plugin' );
 			ariaLabel  = sprintf(
 				/* translators: %s: Plugin name. */