control: Remove setting target = poweron target at startup

After constructing the zone objects, the fan objects are created with
their current target set to what's on dbus. This is then read and set on
the zone as the fan(s) are added to their configured zone. Setting the
target to the configured poweron target of the zone should not be done
by default to ensure the zone is set to whatever the target is of its
contained fan(s).

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: I13bb83e6c06c4220e56c5574ee26c607074c261a
diff --git a/control/json/zone.cpp b/control/json/zone.cpp
index fa4e269..6d2744f 100644
--- a/control/json/zone.cpp
+++ b/control/json/zone.cpp
@@ -274,9 +274,6 @@
         throw std::runtime_error(msg);
     }
     _poweronTarget = jsonObj["poweron_target"].get<uint64_t>();
-
-    // Start with the current target set as the poweron target
-    _target = _poweronTarget;
 }
 
 void Zone::setInterfaces(const json& jsonObj)