simpler migration message

Author: link2xt

src/sql/migrations.rs

@@ -1144,8 +1144,7 @@ CREATE INDEX msgs_status_updates_index2 ON msgs_status_updates (uid);
         //
         // If `add_timestamp >= remove_timestamp`,
         // then the member is currently a member of the chat.
-        // If `add_timestamp < remove_timestamp`,
-        // then the member is a past member.
+        // Otherwise the member is a past member.
         sql.execute_migration(
             "ALTER TABLE chats_contacts
              ADD COLUMN add_timestamp NOT NULL DEFAULT 0;