Refactor RSS widgets loop for clarity

Assigns the result of get_rss_widgets() to a variable before iterating, improving readability and potential reusability.

Author: pfefferle

includes/adapters/class-wordpress.php

@@ -55,7 +55,8 @@ public function get_channels( $channels, $user_id ) { // phpcs:ignore Generic.Co
 			'name' => \__( 'Planet WordPress', 'microsub' ),
 		);
 
-		foreach ( $this->get_rss_widgets() as $widget ) {
+		$rss_widgets = $this->get_rss_widgets();
+		foreach ( $rss_widgets as $widget ) {
 			$channels[] = array(
 				'uid'  => 'wp-rss-' . $widget['id'],
 				'name' => $widget['name'],