systems: Fix missing EnterDwellTime property

Prior commit missed adding a required property to a rewrite using
sdbusplus::unpackProperties()

Fixes a regression introduced in commit
bc1d29de81216e99d0a73c5fd3b6bb7fd2194ba8

Validator passed:
IdlePowerSaver	[JSON Object]	ComputerSystem.v1_16_0.IdlePowerSaver	Yes	complex
IdlePowerSaver.Enabled	False	boolean	Yes	PASS
IdlePowerSaver.EnterUtilizationPercent	8	number	Yes	PASS
IdlePowerSaver.EnterDwellTimeSeconds	240	number	Yes	PASS
IdlePowerSaver.ExitUtilizationPercent	12	number	Yes	PASS
IdlePowerSaver.ExitDwellTimeSeconds	10	number	Yes	PASS

Change-Id: I345c714b71d50d6c8c03120c54bdabe0bd5d0714
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index a38cc3a..029ce58 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -2358,9 +2358,9 @@
 
     const bool success = sdbusplus::unpackPropertiesNoThrow(
         dbus_utils::UnpackErrorPrinter(), properties, "Enabled", enabled,
-        "EnterUtilizationPercent", enterUtilizationPercent,
-        "ExitUtilizationPercent", exitUtilizationPercent, "ExitDwellTime",
-        exitDwellTime);
+        "EnterUtilizationPercent", enterUtilizationPercent, "EnterDwellTime",
+        enterDwellTime, "ExitUtilizationPercent", exitUtilizationPercent,
+        "ExitDwellTime", exitDwellTime);
 
     if (!success)
     {