Fix Rock Island intro email

For some reason this didn't show up for me on my local system -- hopefully this fix will actually work.

uber/templates/emails/guests/rock_island_intro.txt

@@ -2,7 +2,7 @@
 
 {{ c.EVENT_NAME }} encourages performers to sell their merchandise through "Rock Island," where our volunteers sell your merchandise at a booth which is staffed throughout the event. We need you to tell us whether you intend to sell merch at Rock Island by filling out the form at {{ c.URL_BASE }}/guests/merch?guest_id={{ guest.id }}
 
-You must tell us whether you intend to sell merch at Rock Island by {{ g.deadline_from_model('merch')|datetime_local }}. If you do intend to sell merch, you must also input your inventory by {{ c.ROCK_ISLAND_DEADLINE|datetime_local }}. Failure to submit this information on time may result in forfeiture of the opportunity to sell merchandise at Rock Island.
+You must tell us whether you intend to sell merch at Rock Island by {{ guest.deadline_from_model('merch')|datetime_local }}. If you do intend to sell merch, you must also input your inventory by {{ c.ROCK_ISLAND_DEADLINE|datetime_local }}. Failure to submit this information on time may result in forfeiture of the opportunity to sell merchandise at Rock Island.
 
 - Rock Island
 [email protected]