Eliminate a redundant initialization of RequestData._program.

It's set in the superclass constructor, so there's no need to also
set it in the (gsoc) subclass constructor as well. Also it's
unused throughout the subclass.
diff --git a/app/soc/modules/gsoc/views/helper/request_data.py b/app/soc/modules/gsoc/views/helper/request_data.py
index 71b4099..f8f5abe 100644
--- a/app/soc/modules/gsoc/views/helper/request_data.py
+++ b/app/soc/modules/gsoc/views/helper/request_data.py
@@ -210,7 +210,6 @@
     self.models = types.SOC_MODELS
 
     # program wide fields
-    self._program = self._unset
     self._program_timeline = self._unset
     self._programs = self._unset
     self._org_app = self._unset