App Passwords: Return true when rate limiting a password's last used time.

Previously we returned a `WP_Error` instance saying that the password was not found which is inaccurate.

Props dlh.
Reviewed by TimothyBlynJacobs, SergeyBiryukov.
Merges [49739] to the 5.6 branch.
Fixes #51922.
Built from https://develop.svn.wordpress.org/branches/5.6@49740


git-svn-id: http://core.svn.wordpress.org/branches/5.6@49463 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-application-passwords.php

@@ -203,7 +203,7 @@ class WP_Application_Passwords {
 
 			// Only record activity once a day.
 			if ( $password['last_used'] + DAY_IN_SECONDS > time() ) {
-				continue;
+				return true;
 			}
 
 			$password['last_used'] = time();

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-RC2-49738';
+$wp_version = '5.6-RC2-49740';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.