fix: remove unused alert mapping from kela

Author: vesameskanen

app/configurations/config.kela.js

@@ -163,7 +163,6 @@ export default {
   showVehiclesOnStopPage: false,
   showVehiclesOnItineraryPage: false,
   includeCarSuggestions: true,
-  sourceForAlertsAndDisruptions: matkaConfig.sourceForAlertsAndDisruptions,
   // Notice! Turning on this setting forces the search for car routes (for the CO2 comparison only).
   showCO2InItinerarySummary: false,
   useAssembledGeoJsonZones: 'isOnByDefault',