Use deck file parent directory as default watch path in spiel present

[JoshKarpel]

For more consistency with the present() function.

Tasks

• Updated changelog.
• Updated documentation.

[codecov]

Codecov Report

Base: 82.5% // Head: 82.5% // Increases project coverage by +0.0% 🎉

Coverage data is based on head (a6e0b97) compared to base (0f3ece5).
Patch coverage: 100.0% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #199   +/-   ##
=====================================
  Coverage   82.5%   82.5%           
=====================================
  Files         33      33           
  Lines        842     843    +1     
  Branches      96      96           
=====================================
+ Hits         695     696    +1     
  Misses       147     147           

Impacted Files	Coverage Δ
spiel/cli.py	90.7% <100.0%> (+0.1%)	⬆️

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