Added qltui in setup.py

[river-li]

When using pip install qiling, the qltui.py is not copied to the site-packages folder.

Running qltool qltui would get a No module found error.

(test) ➜  qiling git:(master) qltool qltui
Traceback (most recent call last):
  File "/Users/river/.virtualenvs/test/bin/qltool", line 232, in <module>
    import qltui
ModuleNotFoundError: No module named 'qltui'

Added qltui.py in setup.py.

Checklist

Which kind of PR do you create?

• This PR only contains minor fixes.
• This PR contains major feature update.
• This PR introduces a new function/api for Qiling Framework.

Coding convention?

• The new code conforms to Qiling Framework naming convention.
• The imports are arranged properly.
• Essential comments are added.
• The reference of the new code is pointed out.

Extra tests?

• No extra tests are needed for this PR.
• I have added enough tests for this PR.
• Tests will be added after some discussion and review.

Changelog?

• This PR doesn't need to update Changelog.
• Changelog will be updated after some proper review.
• Changelog has been updated in my PR.

Target branch?

• The target branch is dev branch.

One last thing

• I have read the contribution guide

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[kabeor]

Thanks a lot! Merged.