style: enable ParenPad in checkstyle

[samuelfac]

Related to #5119

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

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

Project coverage is 38.74%. Comparing base (f869867) to head (65c0464).

Files	Patch %	Lines
...ealgorithms/datastructures/graphs/BellmanFord.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5226   +/-   ##
=========================================
  Coverage     38.73%   38.74%           
- Complexity     2383     2384    +1     
=========================================
  Files           517      517           
  Lines         15392    15392           
  Branches       2954     2954           
=========================================
+ Hits           5962     5963    +1     
  Misses         9143     9143           
+ Partials        287      286    -1     

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