343 fix enum alarm state (#396)

Co-authored-by: Peter Di Pasquale <peter.di.pasquale@jpl.nasa.gov>

Author: mudinthewater

src/channelLimits/ChannelLimitsProvider.js

@@ -41,7 +41,7 @@ export default class ChannelLimitsProvider {
             }
 
             // enum alarms are dn alarms
-            alarmKey.replace('enum_', 'dn_');
+            alarmKey = alarmKey.replace('enum_', 'dn_');
 
             return alarmKey;
         }