fix logic for log_size_limit https://github.com/Security-Onion-Solutions/securityonion/issues/2737

setup/so-functions

@@ -2277,7 +2277,7 @@ sensor_pillar() {
 set_default_log_size() {
     local percentage
 
-	case $INSTALLTYPE in
+	case $install_type in
 		STANDALONE | EVAL | HEAVYNODE)
 			percentage=50
 			;;