AP_ICEngine : enable starter when soft_armed

This condition was modified to fix the CI autotest error : MAV_CMD_DO_ENGINE_CONTROL
2024-09-03T04:03:41.0759926Z AT-0409.5: Exception caught: Failed to attain RPM1 want 350.0, reached 0
2024-09-03T04:03:41.0760806Z Traceback (most recent call last):
2024-09-03T04:03:41.0761962Z   File "/__w/carbopilot_V2/carbopilot_V2/Tools/autotest/vehicle_test_suite.py", line 8309, in run_one_test_attempt
2024-09-03T04:03:41.0763147Z     test_function(**test_kwargs)
2024-09-03T04:03:41.0764410Z   File "/__w/carbopilot_V2/carbopilot_V2/Tools/autotest/quadplane.py", line 1116, in MAV_CMD_DO_ENGINE_CONTROL
2024-09-03T04:03:41.0765822Z     self.wait_rpm(1, expected_starter_rpm_min, expected_starter_rpm_max)
2024-09-03T04:03:41.0767135Z   File "/__w/carbopilot_V2/carbopilot_V2/Tools/autotest/vehicle_test_suite.py", line 6734, in wait_rpm
2024-09-03T04:03:41.0768213Z     self.wait_and_maintain(
2024-09-03T04:03:41.0769475Z   File "/__w/carbopilot_V2/carbopilot_V2/Tools/autotest/vehicle_test_suite.py", line 6902, in wait_and_maintain
2024-09-03T04:03:41.0770669Z     return self.wait_and_maintain_range(
2024-09-03T04:03:41.0771877Z   File "/__w/carbopilot_V2/carbopilot_V2/Tools/autotest/vehicle_test_suite.py", line 7097, in wait_and_maintain_range
2024-09-03T04:03:41.0773309Z     raise AutoTestTimeoutException(
2024-09-03T04:03:41.0774319Z vehicle_test_suite.AutoTestTimeoutException: Failed to attain RPM1 want 350.0, reached 0

libraries/AP_ICEngine/AP_ICEngine.cpp

@@ -403,7 +403,7 @@ void AP_ICEngine::update(void)
     case ICE_STARTING:
         set_ignition(true);
 
-        if (allow_throttle_while_disarmed()) {
+        if (hal.util->get_soft_armed() || allow_throttle_while_disarmed()) {
             set_starter(true);
         } else {
             set_starter(false);