Widget 'System default' theme changes

* Theme was supposed to be free
* Move dark theme check to getCount. Wasn't always working in
  hasStableIds and I don't expect this to work either

app/src/main/java/org/tasks/dialogs/ThemePickerDialog.kt

@@ -53,10 +53,11 @@ class ThemePickerDialog : DialogFragment() {
     var adapter: ArrayAdapter<String>? = null
     var dialog: AlertDialog? = null
     var selected = -1
+    var widget = false
 
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
         selected = savedInstanceState?.getInt(EXTRA_SELECTED) ?: requireArguments().getInt(EXTRA_SELECTED)
-        val widget = arguments?.getBoolean(EXTRA_WIDGET) ?: false
+        widget = arguments?.getBoolean(EXTRA_WIDGET) ?: false
         val themes = resources.getStringArray(
             if (widget) R.array.widget_themes else R.array.base_theme_names
         )
@@ -131,5 +132,5 @@ class ThemePickerDialog : DialogFragment() {
     private fun available() = isAvailable(selected)
 
     private fun isAvailable(index: Int) =
-        inventory.purchasedThemes() || ThemeBase(index).isFree
+        inventory.purchasedThemes() || ThemeBase(index).isFree || widget
 }

app/src/main/java/org/tasks/widget/ScrollableViewsFactory.kt

@@ -101,6 +101,10 @@ internal class ScrollableViewsFactory(
     override fun onDestroy() {}
 
     override fun getCount(): Int {
+        if (isDark != checkIfDark) {
+            isDark = !isDark
+            localBroadcastManager.reconfigureWidget(widgetId)
+        }
         return tasks.size
     }
 
@@ -119,10 +123,6 @@ internal class ScrollableViewsFactory(
     override fun getItemId(position: Int) = getTask(position)?.id ?: 0
 
     override fun hasStableIds(): Boolean {
-        if (isDark != checkIfDark) {
-            isDark = !isDark
-            localBroadcastManager.reconfigureWidget(widgetId)
-        }
         return true
     }