Install maim/slop instead of sandboxing scripts

The init pause when invoking scr{cap,rec} is too slow.

bin/scrcap

@@ -1,5 +1,4 @@
-#!/usr/bin/env nix-shell
-#! nix-shell -i bash -p maim slop
+#!/usr/bin/env bash
 
 # A script that takes a screenshot (prompts you for what region/window to
 # capture) and stores it in the clipboard.

bin/scrrec

@@ -1,5 +1,4 @@
-#!/usr/bin/env nix-shell
-#! nix-shell -i bash -p ffmpeg slop
+#!/usr/bin/env bash
 
 # Select a region and record it.
 #

modules/desktop/default.nix

@@ -8,6 +8,8 @@
     ffmpeg
     mpv       # video player
     feh       # image viewer
+    maim
+    slop
 
     # Useful apps
     evince    # pdf reader