Revert requiring gtk4 and gdk4

Author: zdohnal

authconn.py

@@ -23,9 +23,9 @@
 import cupspk
 import gi
 from gi.repository import GLib
-gi.require_version('Gdk', '4.0')
+gi.require_version('Gdk', '3.0')
 from gi.repository import Gdk
-gi.require_version('Gtk', '4.0')
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk
 import os
 from errordialogs import *

system-config-printer.py

@@ -37,9 +37,9 @@
 gi.require_version('GdkPixbuf', '2.0')
 from gi.repository import GdkPixbuf
 try:
-    gi.require_version('Gdk', '4.0')
+    gi.require_version('Gdk', '3.0')
     from gi.repository import Gdk
-    gi.require_version('Gtk', '4.0')
+    gi.require_version('Gtk', '3.0')
     from gi.repository import Gtk
     Gtk.init (sys.argv)
 except RuntimeError as e: