Widgets: Remove option to create StackWidgets

StackWidgets have been unfortunately been very unreliable on multiple phones,
and fixing it does not appear to be simple. This commit removes the ability
to create new StackWidgets, but existing ones should remain functional.

uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt

@@ -24,7 +24,6 @@ import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_ID
 import android.appwidget.AppWidgetManager.INVALID_APPWIDGET_ID
 import android.content.Intent
 import android.os.Bundle
-import android.widget.AbsListView.CHOICE_MODE_MULTIPLE
 import android.widget.ArrayAdapter
 import android.widget.Button
 import android.widget.ListView
@@ -34,7 +33,6 @@ import org.isoron.uhabits.R
 import org.isoron.uhabits.activities.AndroidThemeSwitcher
 import org.isoron.uhabits.core.preferences.WidgetPreferences
 import org.isoron.uhabits.widgets.WidgetUpdater
-import java.util.ArrayList
 
 class BooleanHabitPickerDialog : HabitPickerDialog() {
     override fun shouldHideNumerical() = true
@@ -88,20 +86,12 @@ open class HabitPickerDialog : Activity() {
         with(listView) {
             adapter = ArrayAdapter(
                 context,
-                android.R.layout.simple_list_item_multiple_choice,
+                android.R.layout.simple_list_item_1,
                 habitNames
             )
-            choiceMode = CHOICE_MODE_MULTIPLE
-            itemsCanFocus = false
-        }
-        saveButton.setOnClickListener {
-            val selectedIds = mutableListOf<Long>()
-            for (i in 0..listView.count) {
-                if (listView.isItemChecked(i)) {
-                    selectedIds.add(habitIds[i])
-                }
+            setOnItemClickListener { parent, view, position, id ->
+                confirm(mutableListOf(habitIds[position]))
             }
-            confirm(selectedIds)
         }
     }
 

uhabits-android/src/main/res/layout/widget_configure_activity.xml

@@ -30,10 +30,4 @@
         android:layout_weight="1">
     </ListView>
 
-    <Button
-        android:id="@+id/buttonSave"
-        android:layout_height="wrap_content"
-        android:layout_width="match_parent"
-        android:text="@string/save"/>
-
 </LinearLayout>