Fix for agent_name regex (#6108)

The improved regex was introduced with
https://github.com/Significant-Gravitas/AutoGPT/pull/6096

However, there seems to be an issue with the updated regex;
The uppercase meta-character `\W` only matches non-word characters,
i.e. everything that is NOT [A-Za-z0-9_].
What you actually want is to use the lowercase `\w` character.

Co-authored-by: Simon Rummert <09.milieu.motes@icloud.com>

cli.py

@@ -219,7 +219,7 @@ def create(agent_name):
     import re
     import shutil
 
-    if not re.match("\W*$", agent_name):
+    if not re.match("\w*$", agent_name):
         click.echo(
             click.style(
                 f"😞 Agent name '{agent_name}' is not valid. It should not contain spaces or special characters other than -_",