Rename HandleInterrupt to CurrentInterrupt

This is in preparation for adding a fixed cycle version

Change-Id: I20bac62558b9aa74514108e4520ba0f5497c14e4
diff --git a/motors/big/medium_salsa.cc b/motors/big/medium_salsa.cc
index 7e01869..6c3f339 100644
--- a/motors/big/medium_salsa.cc
+++ b/motors/big/medium_salsa.cc
@@ -133,7 +133,7 @@
   }
   const BalancedReadings balanced = BalanceReadings(to_balance);
 
-  global_motor.load(::std::memory_order_relaxed)->HandleInterrupt(
+  global_motor.load(::std::memory_order_relaxed)->CurrentInterrupt(
       balanced,
       global_motor.load(::std::memory_order_relaxed)->wrapped_encoder());
 }