Remove restricted API access

The access to function 'MaterialDialog#getItemSelector' is restricted.
Because of that the linting reported some errors.

I could not find any visible benefit in this call. That is why I have
removed it.

Signed-off-by: Tim Krüger <t@timkrueger.me>

app/src/main/java/com/nextcloud/talk/controllers/bottomsheet/items/ListIconDialogAdapter.kt

@@ -30,7 +30,6 @@ import com.afollestad.materialdialogs.actions.hasActionButton
 import com.afollestad.materialdialogs.actions.hasActionButtons
 import com.afollestad.materialdialogs.internal.list.DialogAdapter
 import com.afollestad.materialdialogs.internal.rtl.RtlTextView
-import com.afollestad.materialdialogs.list.getItemSelector
 import com.afollestad.materialdialogs.utils.MDUtil.inflate
 import com.afollestad.materialdialogs.utils.MDUtil.maybeSetTextColor
 import com.nextcloud.talk.R
@@ -103,7 +102,6 @@ internal class ListIconDialogAdapter<IT : ListItemWithImage>(
         val currentItem = items[position]
 
         holder.titleView.text = currentItem.title
-        holder.itemView.background = dialog.getItemSelector()
         currentItem.populateIcon(holder.iconView)
 
         val activatedIndex = dialog.config[KEY_ACTIVATED_INDEX] as? Int