Fix wrong regexp to get ride of \r

[robertcheramy]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Closes #2997

[codecov-commenter]

Codecov Report

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

Project coverage is 65.49%. Comparing base (50bae60) to head (273b755).

Files	Patch %	Lines
lib/oxidized/input/ssh.rb	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3108   +/-   ##
=======================================
  Coverage   65.49%   65.49%           
=======================================
  Files          34       34           
  Lines        1649     1649           
=======================================
  Hits         1080     1080           
  Misses        569      569           

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