fix(widget): show correct empty-collection toast in deck picker widget config

When the user's collection has no decks, the deck-picker widget config was showing "AnkiDroid is not initialized yet. Please open AnkiDroid and
try again" before closing. The collection is fully initialized in that case the user just has no decks to pick from and re-opening the app won't change anything.

Use empty_collection_state_in_widget ("Collection is empty, use app to add decks then reconfigure") instead, which is already the message the widget itself shows in the same situation, keeping the config and the
widget consistent.

Author: criticalAY

AnkiDroid/src/main/java/com/ichi2/widget/deckpicker/DeckPickerWidgetConfig.kt

@@ -104,14 +104,15 @@ class DeckPickerWidgetConfig :
 
         registerDeckSelectedHandler(action = ::onDeckSelected)
 
-        // Check if the collection is empty before proceeding and if the collection is empty, show a toast instead of the configuration view.
+        // The widget can only be configured against an existing deck. If the collection has
+        // none, show the same message the widget itself displays and close the config screen.
         this.initTask =
             lifecycleScope.launch {
                 if (isCollectionEmpty()) {
                     Timber.w("Closing: Collection is empty")
                     showThemedToast(
                         this@DeckPickerWidgetConfig,
-                        R.string.app_not_initialized_new,
+                        R.string.empty_collection_state_in_widget,
                         false,
                     )
                     finish()