Administration: Remove the smiley from overly happy "No activity yet!" message on Dashboard.

Props francoist, karmatosed, ibdz, estelaris, nrqsnchz, Presskopp.
Fixes #48387.

git-svn-id: https://develop.svn.wordpress.org/trunk@47592 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/dashboard.php

@@ -890,7 +890,6 @@ function wp_dashboard_site_activity() {
 
 	if ( ! $future_posts && ! $recent_posts && ! $recent_comments ) {
 		echo '<div class="no-activity">';
-		echo '<p class="smiley" aria-hidden="true"></p>';
 		echo '<p>' . __( 'No activity yet!' ) . '</p>';
 		echo '</div>';
 	}