Fix usageEvent typo in imports

src/components/Splash/SplashRoot.tsx

@@ -42,7 +42,7 @@ import { DateTime } from 'luxon'
 import { UserActionState } from 'enum/userAction.enum'
 import ActionService from 'services/action.service'
 import { UserChallenge } from 'models'
-import UsageEventService from 'services/usageevent.service'
+import UsageEventService from 'services/usageEvent.service'
 import { UsageEventType } from 'enum/usageEvent.enum'
 
 interface SplashRootProps {

src/services/usageEvent.service.spec.ts

 import { DateTime } from 'luxon'
 import mockClient from '../../tests/__mocks__/client'
-import UsageEventService from './usageevent.service'
+import UsageEventService from './usageEvent.service'
 import { UsageEventEntity } from 'models'
 import { QueryResult } from 'cozy-client'
 import {