Replace is_interactive with interactive for consistency in the code.

Bug: none
Test: unittests
Change-Id: I8c98860cfeadb52c7f8e4931d2ad154ae4211d47
diff --git a/update_attempter.h b/update_attempter.h
index 2ec6174..82fe4c0 100644
--- a/update_attempter.h
+++ b/update_attempter.h
@@ -344,7 +344,7 @@
   // which type of scattering is enabled, etc.) and also updates/deletes
   // the corresponding prefs file used in scattering. Should be called
   // only after the device policy has been loaded and set in the system_state_.
-  void CalculateScatteringParams(bool is_interactive);
+  void CalculateScatteringParams(bool interactive);
 
   // Sets a random value for the waiting period to wait for before downloading
   // an update, if one available. This value will be upperbounded by the