Fix issue #64732
Fix issue #64732

Based on issue #64732, when creating a byte literal with single quotes,
the suggestion message would indicate that you meant to write a `str` literal,
but we actually meant to write a byte string literal.

So I changed the unescape_error_reporting.rs to decide whether to print out
"if you meant to write a `str` literal, use double quotes",
or "if you meant to write a byte string literal, use double quotes".

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust