Completion (Fish): fix fastfetch detection

CarterLi · CarterLi · commit 0cd6cb841d56 · 2023-12-06T10:29:28.000+08:00
diff --git a/completions/fish b/completions/fish
@@ -1,6 +1,6 @@
 #!/usr/bin/env fish
 
-if not test -x fastfetch
+if not type -q fastfetch
     return
 end
 
