Remove logically dead code

Stage::T is never set, so it can never happen.  Remove it entirely.

Found using static analysis.

Tested: Unit tests pass, good coverage here

Change-Id: I0dfb1aad5bef3ab4451df5e81794e56074f6e939
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/include/utils/time_utils.hpp b/redfish-core/include/utils/time_utils.hpp
index 30011e3..1708998 100644
--- a/redfish-core/include/utils/time_utils.hpp
+++ b/redfish-core/include/utils/time_utils.hpp
@@ -53,7 +53,6 @@
         // P1DT1H1M1.100S
         P,
         Days,
-        T,
         Hours,
         Minutes,
         Seconds,
@@ -74,14 +73,10 @@
             stage = ProcessingStage::Days;
             continue;
         }
-        if (stage == ProcessingStage::Days || stage == ProcessingStage::T)
+        if (stage == ProcessingStage::Days)
         {
             if (v.front() == 'T')
             {
-                if (stage == ProcessingStage::T)
-                {
-                    return std::nullopt;
-                }
                 v.remove_prefix(1);
                 stage = ProcessingStage::Hours;
                 continue;