add check for existing pb command

fish/.config/fish/functions/pb.fish

@@ -1,8 +1,12 @@
 function pb
+    if type -q pb > /dev/null
+        command pb $argv
+    else
         if count $argv > /dev/null
             curl -F'file=@'$argv[1] https://0x0.tilde.team
         else
             curl -F'file=@-;filename=stdin.txt' https://0x0.tilde.team
         end
+    end
 end