s/PIDZone/DbusPidZone/g

Renamed PIDZone to DbusPidZone because this object builds in via
inheritance a Dbus implementation of the Mode control interface.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ifc6c11db4952de5909f0e556c41ec25eee217408
diff --git a/main.cpp b/main.cpp
index 5a94efb..55a6d2e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -81,7 +81,7 @@
 void restartControlLoops()
 {
     static SensorManager mgmr;
-    static std::unordered_map<int64_t, std::unique_ptr<PIDZone>> zones;
+    static std::unordered_map<int64_t, std::unique_ptr<DbusPidZone>> zones;
     static std::list<boost::asio::steady_timer> timers;
 
     timers.clear();