yazi: update wrappers not to use cat in subshell

If cat is aliased to bat the non piping operation
in the script might include extra text, use builtins
instead

tests/modules/programs/yazi/fish-integration-expected.fish

@@ -1,7 +1,7 @@
 function yy
     set -l tmp (mktemp -t "yazi-cwd.XXXXX")
     command yazi $argv --cwd-file="$tmp"
-    if set cwd (cat -- "$tmp"); and [ -n "$cwd" ]; and [ "$cwd" != "$PWD" ]
+    if read cwd <"$tmp"; and [ -n "$cwd" ]; and [ "$cwd" != "$PWD" ]
         builtin cd -- "$cwd"
     end
     rm -f -- "$tmp"