use apps template for paypal fallback pages (bug 708028)

apps/addons/templates/addons/paypal_error.html

@@ -1,4 +1,4 @@
-{% extends "base_modal.html" if is_ajax else "base.html" %}
+{% extends "base_modal.html" if is_ajax else "impala/base_shared.html" %}
 
 {% block classes %}paypal-modal{% endblock %}
 

apps/addons/templates/addons/paypal_start.html

@@ -1,4 +1,4 @@
-{% extends "base_modal.html" if is_ajax else "base.html" %}
+{% extends "base_modal.html" if is_ajax else "impala/base_shared.html" %}
 
 {% block classes %}paypal-modal{% endblock %}
 

apps/addons/templates/addons/paypal_thanks.html

@@ -1,4 +1,4 @@
-{% extends "base_modal.html" if is_ajax else "base.html" %}
+{% extends "base_modal.html" if is_ajax else "impala/base_shared.html" %}
 
 {% block classes %}paypal-modal{% endblock %}