fix(tui): stop the event handler on quit

[orhun]

Description of change

I realized we are not stopping the event handling loop when the restart command is send.

fixes #13

How has this been tested? (if applicable)

Locally.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 3.67%. Comparing base (236d19e) to head (c3f4a0d).

Files with missing lines	Patch %	Lines
src/lib.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##            main     #24      +/-   ##
========================================
- Coverage   3.67%   3.67%   -0.00%     
========================================
  Files         18      18              
  Lines       2212    2213       +1     
========================================
  Hits          81      81              
- Misses      2131    2132       +1     

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