Fix Zulip 401 when bot name contains a dash

[c-w]

Description

Sending a message to Zulip failed with my setup:

> docker run --entrypoint=apprise --rm caronc/apprise -vv -t "Test title" -b "Test body" "zulip://some-name@someorganization.zulipchat.com/<token>/Alerts"
2022-05-02 14:14:33,816 - INFO - Notifying 1 service(s) asynchronously.
2022-05-02 14:14:34,047 - WARNING - Failed to send Zulip notification to Alerts: Unauthorized - Invalid Token., error=401.

The error is caused because the regex used to parse the bot name only considered the part before the first dash leading to an invalid user name being sent in the request's basic auth.

This pull request fixes the issue by making the bot name regex more permissive and manually stripping off the -bot suffix instead of doing it in the regex.

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

[codecov-commenter]

Codecov Report

Merging #581 (7633e1b) into master (fd0cb3f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #581   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          109       109           
  Lines        14094     14099    +5     
  Branches      2637      2637           
=========================================
+ Hits         14094     14099    +5     

Impacted Files	Coverage Δ
apprise/plugins/NotifyZulip.py	100.00% <100.00%> (ø)
apprise/utils.py	100.00% <100.00%> (ø)

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[caronc]

Thank you for this PR! 🚀