Fix power supply present delay

The member variable indicating a power supply is present should be
updated after the timer expires. If the message is not indicating
present, the variable should be set to false and the timer stopped.

Change-Id: Id5b78e42858cc2dd96b8a3fc9ecb21ec4eec6b10
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/power-supply/power_supply.cpp b/power-supply/power_supply.cpp
index 8a00d59..7eb4569 100644
--- a/power-supply/power_supply.cpp
+++ b/power-supply/power_supply.cpp
@@ -166,15 +166,14 @@
     auto valPropMap = msgData.find(PRESENT_PROP);
     if (valPropMap != msgData.end())
     {
-        present = sdbusplus::message::variant_ns::get<bool>(valPropMap->second);
-
-        if (present)
+        if (sdbusplus::message::variant_ns::get<bool>(valPropMap->second))
         {
             clearFaults();
             presentTimer.start(presentInterval, Timer::TimerType::oneshot);
         }
         else
         {
+            present = false;
             presentTimer.stop();
         }
     }