Replace is_interactive with interactive for consistency in the code.

Bug: none
Test: unittests
Change-Id: I8c98860cfeadb52c7f8e4931d2ad154ae4211d47
diff --git a/update_manager/default_policy.cc b/update_manager/default_policy.cc
index 5da1520..bc4f98e 100644
--- a/update_manager/default_policy.cc
+++ b/update_manager/default_policy.cc
@@ -40,7 +40,7 @@
   result->updates_enabled = true;
   result->target_channel.clear();
   result->target_version_prefix.clear();
-  result->is_interactive = false;
+  result->interactive = false;
 
   // Ensure that the minimum interval is set. If there's no clock, this defaults
   // to always allowing the update.