feat(home/base.scm): use 256 color theme for bat

Use the 256 color theme instead, as it can be more accurate. Can have issues
with Alacritty though, such as white text on white text.

Author: gs-101

guix/modules/home/base.scm

@@ -73,7 +73,7 @@
                   (home-bash-configuration
                    (aliases '(("grep" . "grep -P -i -n -H -q -R --devices=read --color=auto")
                               (".." . "cd ..")
-                              ("bat" . "bat --color auto --decorations auto --paging never --theme=base16")
+                              ("bat" . "bat --color auto --decorations auto --paging never --theme=base16-256")
                               ("eza" . "eza -l -X --color auto --icons auto --hyperlink -a --group-directories-first --smart-group -h --changed --git")
                               ("ip" . "ip -color=auto")
                               ("df" . "df -H")