chore: autocorrect rubocop offenses in appengine and jobs samples

[torreypayne]

Fixes Rubocop errors reported in presubmit:

• appengine/rails-hello_world/bin/setup: Style/MethodDefParentheses
• appengine/standard-static-files/rails/bin/setup: Style/MethodDefParentheses
• appengine/static_files/rails/bin/setup: Style/MethodDefParentheses
• jobs/V3/filter_search_sample.rb: Layout/IndentationWidth, Layout/ClosingParenthesisIndentation

Autocorrected via Rubocop CLI (bundle exec rubocop -a).

[gemini-code-assist]

Code Review

This pull request removes parentheses from the system! method definition in several setup scripts and adjusts the indentation of the max_compensation parameter in jobs/V3/filter_search_sample.rb. The review feedback correctly points out that this indentation change introduces a layout inconsistency relative to the sibling min_compensation parameter and suggests a uniform formatting structure for better readability.

[aandreassa]

Lets also use chore just in case. Not sure what style does.