add win+shift+b to change window border and update screenshot

modules/sway/default.nix

@@ -121,6 +121,7 @@
       in lib.mkOptionDefault {
         "${modifier}+z" = "exec ${homeDir}/.config/sway/idle.sh";
         "${modifier}+Shift+s" = "sticky toggle";
+        "${modifier}+Shift+b" = "border toggle";
         "${modifier}+g" = "exec ${homeDir}/.config/sway/random-bg.py onetime";
         "${modifier}+n" = "exec pcmanfm";
         "Print" = "exec flameshot gui --raw | wl-copy";