Use path basename instead of basename

This is faster and guaranteed to be available

share/tools/web_config/sample_prompts/arrow.fish

@@ -76,7 +76,7 @@ function fish_prompt
         set arrow "$arrow_color# "
     end
 
-    set -l cwd $cyan(basename (prompt_pwd))
+    set -l cwd $cyan(prompt_pwd | path basename)
 
     set -l repo_info
     if set -l repo_type (_repo_type)

share/tools/web_config/sample_prompts/minimalist.fish

@@ -3,7 +3,7 @@
 
 function fish_prompt
     set_color $fish_color_cwd
-    echo -n (basename $PWD)
+    echo -n (path basename $PWD)
     set_color normal
     echo -n ' ) '
 end

share/tools/web_config/sample_prompts/nim.fish

@@ -109,7 +109,7 @@ function fish_prompt
     set -q VIRTUAL_ENV_DISABLE_PROMPT
     or set -g VIRTUAL_ENV_DISABLE_PROMPT true
     set -q VIRTUAL_ENV
-    and _nim_prompt_wrapper $retc V (basename "$VIRTUAL_ENV")
+    and _nim_prompt_wrapper $retc V (path basename "$VIRTUAL_ENV")
 
     # git
     set -l prompt_git (fish_git_prompt '%s')

share/tools/web_config/sample_prompts/pythonista.fish

@@ -23,7 +23,7 @@ function fish_prompt
     # Line 2
     echo
     if test -n "$VIRTUAL_ENV"
-        printf "(%s) " (set_color blue)(basename $VIRTUAL_ENV)(set_color normal)
+        printf "(%s) " (set_color blue)(path basename $VIRTUAL_ENV)(set_color normal)
     end
     printf '↪ '
     set_color normal