Update ampstart.sh

Preserve environment about host

Author: PhonicUK

ampstart.sh

@@ -28,5 +28,5 @@ export AMP_CONTAINER
 export AMPMEMORYLIMIT
 
 ARGS=$@
-exec su -l -c "ampinstmgr --sync-certs; cd /AMP; HOME=/home/amp /AMP/AMP_Linux_x86_64 ${ARGS}; exit $?" -- amp
+exec su -l -w AMPHOSTPLATFORM,AMP_CONTAINER,AMPMEMORYLIMIT -c "ampinstmgr --sync-certs; cd /AMP; HOME=/home/amp /AMP/AMP_Linux_x86_64 ${ARGS}; exit $?" -- amp
 exit $?