Remove unused queuegroup hash

It turns out we never used it, so let's kill it.  Makes it easier to
move to event loops since we really just want the string to represent
the world.

Change-Id: If3815bdc02b98237c409afaa59cbf926657b1555
diff --git a/frc971/codelab/basic_test.cc b/frc971/codelab/basic_test.cc
index 0761cb2..5132407 100644
--- a/frc971/codelab/basic_test.cc
+++ b/frc971/codelab/basic_test.cc
@@ -20,7 +20,7 @@
 class BasicSimulation {
  public:
   BasicSimulation()
-      : basic_queue_(".frc971.codelab.basic_queue", 0x78d8e372,
+      : basic_queue_(".frc971.codelab.basic_queue",
                      ".frc971.codelab.basic_queue.goal",
                      ".frc971.codelab.basic_queue.position",
                      ".frc971.codelab.basic_queue.output",
@@ -60,7 +60,7 @@
 class BasicControlLoopTest : public ::aos::testing::ControlLoopTest {
  public:
   BasicControlLoopTest()
-      : basic_queue_(".frc971.codelab.basic_queue", 0x78d8e372,
+      : basic_queue_(".frc971.codelab.basic_queue",
                      ".frc971.codelab.basic_queue.goal",
                      ".frc971.codelab.basic_queue.position",
                      ".frc971.codelab.basic_queue.output",