Mark any paid transactions as uncancelled

Rarely, we can have a transaction get marked as cancelled on our end while going through on Stripe's end. This will automatically uncancel any transactions that get marked as paid. Also renames "Refund Item" to "Refund Options" to hopefully make what that button does clearer.

uber/payments.py

@@ -1095,6 +1095,9 @@ def mark_paid_from_ids(intent_id, charge_id):
             session.add(txn)
             txn_receipt = txn.receipt
 
+            if txn.cancelled != None:
+                txn.cancelled == None
+
             for item in txn.receipt_items:
                 item.closed = datetime.now()
                 session.add(item)

uber/templates/reg_admin/receipt_items.html

@@ -568,7 +568,7 @@ <h2>Receipt{% if other_receipts %}s{% endif %} for {% if model.attendee %}{{ mod
                   Refund
                   {% else %}
                   refundItem('{{ item.id }}', '{{ (item.amount / 100)|format_currency }}', '{{ item.count }}', '{{ item.revert_change|yesno }}')">
-                  Refund Item
+                  Refund Options
                   {% endif %}
           </button>
           {% endif %}