Fall back to exa for compatibility

Author: dieggsy

functions/_fifc_preview_dir.fish

@@ -1,6 +1,8 @@
 function _fifc_preview_dir -d "List content of the selected directory"
     if type -q eza
         eza --color=always $fifc_eza_opts $fifc_candidate
+    else if type -q exa
+        exa --color=always $fifc_exa_opts $fifc_candidate
     else
         ls --color=always $fifc_ls_opts $fifc_candidate
     end