Check message/attachment files on manual clean only

app/src/main/java/eu/faircode/email/WorkerCleanup.java

@@ -135,6 +135,7 @@ public class WorkerCleanup extends Worker {
                                 Log.w("Error deleting " + file);
                         }
 
+            if (manual) {
                 // Check message files
                 Log.i("Checking message files");
                 List<Long> mids = db.message().getMessageWithContent();
@@ -158,6 +159,7 @@ public class WorkerCleanup extends Worker {
                         db.attachment().setUnavailable(aid);
                     }
                 }
+            }
 
             Log.i("Cleanup contacts");
             int contacts = db.contact().deleteContacts(now - KEEP_CONTACTS_DURATION);