Chyrp: Fix for escaped symbol loss

Forum topic: http://chyrp.net/discuss/topic/symbol-problems/
admin/theme/default/partials/post_fields.twig, line 25 (textarea): Change
{% if not field.no_value %}${ field.value | fallback(post[field.attr] | escape(false, false)) }{% endif %}
to
{% if not field.no_value %}${ field.value | fallback(post[field.attr]) | replace("&", "&") | escape(false, false) }{% endif %}
... that's it.