Reverse order of files and directories in __fish_complete_suffix output

Ordering of directories above files was introduced in a recent change to
the same script. By default it does not matter as completions are sorted
by fish internally, but this allows the use of `-k` to sort files before
directories (or piped to `sort -r` for vice-versa).

share/functions/__fish_complete_suffix.fish

@@ -63,7 +63,7 @@ function __fish_complete_suffix -d "Complete using files"
         end
     end
 
-    set files $dirs $all
+    set files $all $dirs
     if string match -qr '^\\./' -- $comp
         set files ./$files
     end