Replace is_interactive with interactive for consistency in the code.

Bug: none
Test: unittests
Change-Id: I8c98860cfeadb52c7f8e4931d2ad154ae4211d47
diff --git a/update_manager/policy.h b/update_manager/policy.h
index 05bb2ad..f7a72d8 100644
--- a/update_manager/policy.h
+++ b/update_manager/policy.h
@@ -51,7 +51,7 @@
   std::string target_channel;
 
   // Whether the allowed update is interactive (user-initiated) or periodic.
-  bool is_interactive;
+  bool interactive;
 };
 
 // Input arguments to UpdateCanStart.
@@ -64,7 +64,7 @@
   //
   // Whether the current update check is an interactive one. The caller should
   // feed the value returned by the preceding call to UpdateCheckAllowed().
-  bool is_interactive;
+  bool interactive;
   // Whether it is a delta payload.
   bool is_delta_payload;
   // Wallclock time when payload was first (consecutively) offered by Omaha.