Support for multi-monitor setup

[aniketfuryrocks]

Current

/usr/lib/xscreensaver/gluqlo -f

cause the window to expand to all the screens, due to which the clock is split between monitors.

Expected Result

The primary monitor should present the clock while other monitors should show a black screen.

Platform

          /:-------------:\          aniket@fedora
       :-------------------::        -------------
     :-----------/shhOHbmp---:\      OS: Fedora 34 (Workstation Edition) x86_64
   /-----------omMMMNNNMMD  ---:     Host: 81BF Ideapad 520-15IKB
  :-----------sMMMMNMNMP.    ---:    Kernel: 5.13.8-200.fc34.x86_64
 :-----------:MMMdP-------    ---\   Uptime: 50 mins
,------------:MMMd--------    ---:   Packages: 2272 (rpm), 27 (flatpak)
:------------:MMMd-------    .---:   Shell: fish 3.3.1
:----    oNMMMMMMMMMNho     .----:   Resolution: 1600x900, 1920x1080
:--     .+shhhMMMmhhy++   .------/   DE: GNOME 40.3
:-    -------:MMMd--------------:    WM: Mutter
:-   --------/MMMd-------------;     WM Theme: WhiteSur-dark
:-    ------/hMMMy------------:      Theme: WhiteSur-dark [GTK2/3]
:-- :dMNdhhdNMMNo------------;       Icons: WhiteSur [GTK2/3]
:---:sdNMMMMNds:------------:        Terminal: alacritty
:------:://:-------------::          Terminal Font: black: '0x212121'
:---------------------://            CPU: Intel i5-8250U (8) @ 3.400GHz
                                     GPU: Intel UHD Graphics 620
                                     GPU: NVIDIA GeForce MX150
                                     Memory: 4837MiB / 7721MiB