Gift card payment: Clean-up some code (#5574)

* Remove apparently unused code

* Move templates that do not belong in pretixcontrol

src/pretix/control/templates/pretixcontrol/giftcards/checkout.html

@@ -1,33 +0,0 @@
-{% load i18n %}
-{% load bootstrap3 %}
-{% load money %}
-{% load rich_text %}
-
-{{ request.event.settings.payment_giftcard_public_description|rich_text }}
-{% if customer_gift_cards %}
-    <p><strong>
-        <span class="sr-only">{% trans "Information" %}</span>
-        {% trans "The following gift cards are available in your customer account:" %}
-    </strong></p>
-    {% csrf_token %}
-    <ul class="list-group">
-        {% for c in customer_gift_cards %}
-            <li class="list-group-item row row-no-gutters">
-                <div class="col-sm-8 col-md-9" id="gc-code-{{ forloop.counter }}">
-                    {{ c }}
-                </div>
-                <div class="col-sm-2 text-right" id="gc-value-{{ forloop.counter }}">
-                    {{ c.value|money:c.currency }}
-                </div>
-                <div class="col-sm-2 col-md-1 text-right">
-                    <button name="use_giftcard" class="btn btn-primary btn-xs use_giftcard" data-value="{{ c.secret }}"
-                            title="{% trans "Use gift card" %}"
-                            aria-describedby="gc-code-{{ forloop.counter }} gc-value-{{ forloop.counter }}">
-                        {% trans "Apply" %}
-                    </button>
-                </div>
-            </li>
-        {% endfor %}
-    </ul>
-{% endif %}
-{% bootstrap_form form layout='checkout' %}

src/pretix/control/templates/pretixcontrol/giftcards/checkout_confirm.html

@@ -1,7 +0,0 @@
-{% load i18n %}
-
-<p>
-    {% blocktrans trimmed with card=info_data.gift_card_secret %}
-        Your gift card {{ card }} will be used to pay for this order.
-    {% endblocktrans %}
-</p>