Allow arbitrary punctuation before scala-steward:off

[fthomas]

This supports using scala-steward:off in files that do not use // for single line comments.

Motivated by broadinstitute/cromwell#6053.

[codecov]

Codecov Report

Merging #1811 (9afe476) into master (b21a75c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1811   +/-   ##
=======================================
  Coverage   74.68%   74.68%           
=======================================
  Files         123      123           
  Lines        2074     2074           
  Branches       53       53           
=======================================
  Hits         1549     1549           
  Misses        525      525           

Impacted Files	Coverage Δ
...ain/scala/org/scalasteward/core/edit/package.scala	100.00% <100.00%> (ø)

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