Fix: interrupt enabling at the end of vTaskExitCritical

When xSchedulerRunning is false interrupts are always disabled in vTaskExitCritical. Adds portENABLE_INTERRUPTS() in vTaskExitCritical when scheduling is false.

tasks.c

@@ -4367,7 +4367,7 @@ static void prvResetNextTaskUnblockTime( void )
         }
         else
         {
-            mtCOVERAGE_TEST_MARKER();
+            portENABLE_INTERRUPTS();
         }
     }