Remove chip setting migration

app/src/main/java/com/todoroo/astrid/service/Upgrader.kt

@@ -59,11 +59,6 @@ class Upgrader @Inject constructor(
             run(from, V8_10) { migrateWidgets() }
             run(from, V9_3) { applyCaldavOrder() }
             run(from, V9_6) {
-                val chips = preferences.getBoolean("show_list_indicators", true)
-                preferences.showSubtaskChip = chips
-                preferences.showPlaceChip = chips
-                preferences.showListChip = chips
-                preferences.showTagChip = chips
                 preferences.setBoolean(R.string.p_astrid_sort_enabled, true)
                 taskMover.migrateLocalTasks()
             }

app/src/main/java/org/tasks/preferences/Preferences.kt

@@ -453,21 +453,17 @@ class Preferences @JvmOverloads constructor(
     val themeBase: Int
         get() = getInt(R.string.p_theme, ThemeBase.DEFAULT_BASE_THEME)
 
-    var showSubtaskChip: Boolean
+    val showSubtaskChip: Boolean
         get() = getBoolean(R.string.p_subtask_chips, true)
-        set(value) = setBoolean(R.string.p_subtask_chips, value)
 
-    var showPlaceChip: Boolean
+    val showPlaceChip: Boolean
         get() = getBoolean(R.string.p_place_chips, true)
-        set(value) = setBoolean(R.string.p_place_chips, value)
 
-    var showListChip: Boolean
+    val showListChip: Boolean
         get() = getBoolean(R.string.p_list_chips, true)
-        set(value) = setBoolean(R.string.p_list_chips, value)
 
-    var showTagChip: Boolean
+    val showTagChip: Boolean
         get() = getBoolean(R.string.p_tag_chips, true)
-        set(value) = setBoolean(R.string.p_tag_chips, value)
 
     fun alreadyNotified(account: String?, scope: String?): Boolean =
             getBoolean(context.getString(R.string.p_notified_oauth_error, account, scope), false)