Follow-up from "Resolve "Visual regression in 12.0: line numbers not lining up in file view""

The following discussion from !29403 (merged) should be addressed:

• @psimyn started a discussion:

  @tauriedavis do you know if line height should be 1.5 or 1.6?

  I went with 1.5 because that matched the 19px value that was currently there (explained in description). But I noticed that the Commit page uses 1.6 currently. Preview

  table.code tr.line_holder td {
    line-height: 1.6;
    font-size: 90%;
  }

  They are basically the same, I am leaning toward 1.5 since that's what we use basically everywhere else. Can commit line-height be changed or we want the extra breathing room for code?