[#3018] Added type cast to config item in template

After feedback from @tobes at #171 (comment)

ckan/templates/activity_streams/activity_stream_items.html

@@ -1,4 +1,4 @@
-{% set has_more_length = config.get("ckan.activity_list_limit", 30) %}
+{% set has_more_length = config.get("ckan.activity_list_limit", 30)|int %}
 {% set has_more = activities|length > has_more_length %}
 
 <ul class="activity" data-module="activity-stream" data-module-more="{{ has_more }}" data-module-context="{{ controller }}" data-module-id="{{ id }}" data-module-offset="{{ offset }}">