fix: report SVG values without quotes

[danielpeintner]

fixes #965

[danielpeintner]

Note: I think it is a very hack fix and I am not sure what we can/should to else.

Buffer.from("XXX");

returns a buffer of the XXX string around with quotes.

[relu91]

Checked https://datatracker.ietf.org/doc/html/rfc822#appendix-A and it seems that also text/plain does not require quotes around the body, so I think we can get rid of the boolean modifier and always return the unquoted value.

Also as a solution to the issue, instead of checking if the value in input is a string and doing Buffer manipulation, why don't we do something like the following:

        let body = "";
        if (value !== undefined) {
           if (typeof(value) === 'string') {
             body = value
          } else {
              body = JSON.stringify(value)
          }
       }

[danielpeintner]

@relu91 I integrated you proposed changes. Please have a look.

[relu91]

LGTM