Revert: https://gitlab.gnome.org/GNOME/gnome-flashback/-/commit/5f4aa0d8

From 5f4aa0d89e1f2022ebc9c59d9a2171b00643f847 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberts=20Muktup=C4=81vels?= <alberts.muktupavels@gmail.com>
Date: Sun, 28 Sep 2025 11:45:53 +0300
Subject: [PATCH] schemas: remove no longer needed settings

These was used to start/stop services by GNOME Session. Related
services now are started by systemd and these settings are no
longer used.

https://gitlab.gnome.org/GNOME/gnome-flashback/-/issues/103

--- data/schemas/org.gnome.gnome-flashback.gschema.xml.orig	2025-09-28 09:52:06 UTC
+++ data/schemas/org.gnome.gnome-flashback.gschema.xml
@@ -17,6 +17,11 @@
       <description>If set to true, then GNOME Flashback application will be used to automount removable media.</description>
     </key>
 
+    <key name="clipboard" type="b">
+      <default>true</default>
+      <summary>Clipboard</summary>
+    </key>
+
     <key name="desktop" type="b">
       <default>true</default>
       <summary>Desktop</summary>
@@ -28,6 +33,12 @@
       <description>If set to true, then GNOME Flashback application will be used to show the end session dialog.</description>
     </key>
 
+    <key name="idle-monitor" type="b">
+      <default>true</default>
+      <summary>Idle monitor</summary>
+      <description>If set to true, then GNOME Flashback application will be used for user activity monitoring.</description>
+    </key>
+
     <key name="input-settings" type="b">
       <default>true</default>
       <summary>Input settings</summary>
@@ -43,6 +54,12 @@
       <default>true</default>
       <summary>Notification daemon</summary>
       <description>If set to true, then GNOME Flashback application will be used to manage notifications.</description>
+    </key>
+
+    <key name="polkit" type="b">
+      <default>true</default>
+      <summary>Authentication agent for polkit</summary>
+      <description>This is the same authentication agent that was provided by PolicyKit-gnome.</description>
     </key>
 
     <key name="root-background" type="b">