remove magic numbers

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/models/domain/converters/DomainEnumNotificationLevelConverter.kt

@@ -25,21 +25,28 @@ import com.nextcloud.talk.models.domain.NotificationLevel
 class DomainEnumNotificationLevelConverter : IntBasedTypeConverter<NotificationLevel>() {
     override fun getFromInt(i: Int): NotificationLevel {
         return when (i) {
-            0 -> NotificationLevel.DEFAULT
-            1 -> NotificationLevel.ALWAYS
-            2 -> NotificationLevel.MENTION
-            3 -> NotificationLevel.NEVER
+            DEFAULT -> NotificationLevel.DEFAULT
+            ALWAYS -> NotificationLevel.ALWAYS
+            MENTION -> NotificationLevel.MENTION
+            NEVER -> NotificationLevel.NEVER
             else -> NotificationLevel.DEFAULT
         }
     }
 
     override fun convertToInt(`object`: NotificationLevel): Int {
         return when (`object`) {
-            NotificationLevel.DEFAULT -> 0
-            NotificationLevel.ALWAYS -> 1
-            NotificationLevel.MENTION -> 2
-            NotificationLevel.NEVER -> 3
-            else -> 0
+            NotificationLevel.DEFAULT -> DEFAULT
+            NotificationLevel.ALWAYS -> ALWAYS
+            NotificationLevel.MENTION -> MENTION
+            NotificationLevel.NEVER -> NEVER
+            else -> DEFAULT
         }
     }
+
+    companion object {
+        private const val DEFAULT: Int = 0
+        private const val ALWAYS: Int = 1
+        private const val MENTION: Int = 2
+        private const val NEVER: Int = 3
+    }
 }