Clarify: Visibility hidden vs. archived (#7970)

fix https://github.com/FreshRSS/FreshRSS/issues/7887
We have two concepts: how much a feed is shown or not (controlled by priority), and how often a feed is refreshed (or not, in which case it is archived).
This PR removes the wording *Archived* from the *visibility* parameter, since this is not what it does.

app/Models/UserQuery.php

@@ -140,10 +140,10 @@ class FreshRSS_UserQuery {
 				case 'a':	// All PRIORITY_MAIN_STREAM
 					$this->get_type = 'all';
 					break;
-				case 'A':	// All except PRIORITY_ARCHIVED
+				case 'A':	// All except PRIORITY_HIDDEN
 					$this->get_type = 'A';
 					break;
-				case 'Z':	// All including PRIORITY_ARCHIVED
+				case 'Z':	// All including PRIORITY_HIDDEN
 					$this->get_type = 'Z';
 					break;
 				case 'c':