Selectively ignore opponent's human player station april tag

We don't have the april tags set up for our auto testing, so don't rely
on that tag.

Change-Id: I93cf62ace8e478f16e364797c0b5f4495188b548
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/frc971/control_loops/drivetrain/localization/utils.h b/frc971/control_loops/drivetrain/localization/utils.h
index 26242f9..cfd443a 100644
--- a/frc971/control_loops/drivetrain/localization/utils.h
+++ b/frc971/control_loops/drivetrain/localization/utils.h
@@ -29,6 +29,7 @@
   // Returns true if either there is no JoystickState message available or if
   // we are currently in autonomous mode.
   bool MaybeInAutonomous();
+  aos::Alliance Alliance();
 
   // Returns the offset between our node and the specified node (or nullopt if
   // no offset is available). The sign of this will be such that the time on