Remove unnecessary quotes from dashboard process arguments

[hrntsm]

Reference Issues/PRs

Fixes #420

What does this implement/fix? Explain your changes.

[codeclimate]

Code Climate has analyzed commit db72c26 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

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

Project coverage is 45.14%. Comparing base (9a27c3f) to head (db72c26).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
Optuna/Dashboard/Handler.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #425      +/-   ##
===========================================
+ Coverage    45.06%   45.14%   +0.08%     
===========================================
  Files           67       67              
  Lines         3180     3185       +5     
  Branches       365      365              
===========================================
+ Hits          1433     1438       +5     
  Misses        1700     1700              
  Partials        47       47              

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