For #12531: Align Settings -> Private browsing to 72dp keyline (#12654)

Co-authored-by: Hakkı Kaan Çalışkan <[email protected]>

app/src/main/res/xml/private_browsing_preferences.xml

@@ -2,20 +2,16 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <androidx.preference.Preference
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <Preference
         android:key="@string/pref_key_add_private_browsing_shortcut"
-        android:title="@string/preferences_add_private_browsing_shortcut"
-        app:iconSpaceReserved="false" />
+        android:title="@string/preferences_add_private_browsing_shortcut" />
     <SwitchPreference
         android:defaultValue="false"
         android:key="@string/pref_key_open_links_in_a_private_tab"
-        android:title="@string/preferences_open_links_in_a_private_tab"
-        app:iconSpaceReserved="false" />
+        android:title="@string/preferences_open_links_in_a_private_tab" />
     <SwitchPreference
         android:defaultValue="false"
         android:key="@string/pref_key_allow_screenshots_in_private_mode"
-        android:title="@string/preferences_allow_screenshots_in_private_mode"
-        app:iconSpaceReserved="false" />
+        android:title="@string/preferences_allow_screenshots_in_private_mode" />
 </PreferenceScreen>