'$' not escaped when printing a multi-line string

If the equality matcher fails for a string, in the "Actual" section where it prints each line as a single-quoted string, the dollar sign should be escaped.

Here is the output where I saw this: 'const M$json = const {\n'

Reproduce a failed equality matcher using a multi-line string containing a dollar sign, then locate the code that formats the Actual section as single-quoted lines. Done means the dollar sign is escaped in that output without changing other string formatting.

Written by the indexing model from the issue text.