remove the redundant event insert anonymous callback

app/src/main/kotlin/com/simplemobiletools/calendar/activities/EventActivity.kt

@@ -301,7 +301,7 @@ class EventActivity : SimpleActivity(), DBHelper.EventUpdateListener {
         }
 
         if (mEvent.id == 0) {
-            dbHelper.insert(mEvent) {}
+            dbHelper.insert(mEvent)
         } else {
             dbHelper.update(mEvent)
         }

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt

@@ -131,7 +131,7 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         addEventType(eventType, db)
     }
 
-    fun insert(event: Event, insertListener: (event: Event) -> Unit) {
+    fun insert(event: Event) {
         if (event.startTS > event.endTS || event.title.trim().isEmpty())
             return
 
@@ -147,7 +147,6 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         context.updateWidgets()
         context.scheduleReminder(event)
         mEventsListener?.eventInserted(event)
-        insertListener.invoke(event)
     }
 
     fun update(event: Event) {

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/IcsImporter.kt

@@ -84,7 +84,7 @@ class IcsImporter {
                         val event = Event(0, curStart, curEnd, curTitle, curDescription, curReminderMinutes.getOrElse(0, { -1 }),
                                 curReminderMinutes.getOrElse(1, { -1 }), curReminderMinutes.getOrElse(2, { -1 }), curRepeatInterval,
                                 curImportId, curFlags, curRepeatLimit, curEventType)
-                        context.dbHelper.insert(event) { }
+                        context.dbHelper.insert(event)
                         eventsImported++
                         resetValues()
                     }