remove shift-ins in atom feed

they cause the feed to bork
diff --git a/site/api/atom.lua b/site/api/atom.lua
index 0060ea1..adc91eb 100644
--- a/site/api/atom.lua
+++ b/site/api/atom.lua
@@ -236,7 +236,7 @@
            r:escape_html(eml['message-id']),
            r:escape_html(eml['message-id']),
            date,
-           r:escape_html(eml.body)
+           r:escape_html(eml.body:gsub("\x0F", ""))
            ))
     end
     r:puts[[</feed>]]