Revert "Qt: set breeze as default theme"

This reverts commit 31d935254b.

Now that we are adding kali purple themes I've noticed that breeze qt
theme doens't follow the color-palette everywhere. In some cases it
still shows the blue highlight color.
Plus installing it in Xfce as an example takes 40MiB (unpacked)

debian/kali-themes.postinst

@@ -97,6 +97,7 @@ if [ "$1" = "configure" ]; then
 	    install_config_file /etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfwm4.xml force
 	fi
 	if dpkg --compare-versions "$2" lt "2022.1.0"; then
+	    install_config_file /etc/xdg/qt5ct/qt5ct.conf force
 	    install_config_file /etc/lightdm/lightdm-gtk-greeter.conf force
 	    install_config_file /etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-power-manager.xml force
 	fi
@@ -120,9 +121,6 @@ if [ "$1" = "configure" ]; then
 	    install_config_file /etc/xdg/xfce4/whiskermenu/defaults.rc force
 	    install_config_file /etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xsettings.xml force
 	fi
-	if dpkg --compare-versions "$2" lt "2023.1.3"; then
-	    install_config_file /etc/xdg/qt5ct/qt5ct.conf force
-	fi
 	# Install remaining new files
 	install_all
     fi