Fix interface usage for OperatingSystemState

OperatingSystemState property of
xyz.openbmc_project.State.OperatingSystem.Status should be PDI enum of
type OSStatus.  This commit fixes the OperatingSystemState values to
be compatible with PDI.

Tested:
Confirmed that the OperatingSystemState check returns true when the
system resets and OperatingSystemState changes to the full enum
string of "xyz...Inactive".

Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
Change-Id: I8bac5456905aaecd77e44f96fccb72699a1c128b
diff --git a/service/src/mainapp.cpp b/service/src/mainapp.cpp
index 8a91dab..5560d5f 100644
--- a/service/src/mainapp.cpp
+++ b/service/src/mainapp.cpp
@@ -524,8 +524,16 @@
                     std::get_if<std::string>(&it->second);
                 if (state != nullptr)
                 {
+                    // The short strings "BootComplete" and "Standby" are
+                    // deprecated in favor of the full enum strings
+                    // Support for the short strings will be removed in the
+                    // future.
                     if (((*state == "BootComplete") ||
-                         (*state == "Inactive")) &&
+                         (*state == "xyz.openbmc_project.State.OperatingSystem."
+                                    "Status.OSStatus.BootComplete") ||
+                         (*state == "Inactive") ||
+                         (*state == "xyz.openbmc_project.State.OperatingSystem."
+                                    "Status.OSStatus.Inactive")) &&
                         (stateTimerRunning))
                     {
                         stateTimer->cancel();