Fixes ISSUE-49243: Quotes in the username should not be escaped

Escaping some characters used to be needed because the callout response was returned as executable javascript [1]. That changed some releases ago, now the result is returned in a JSON object so there is no longer need to escape those characters.

[1] https://gitlab.com/openbravo/product/openbravo/-/blame/e54fe6a48d100ee2264470cf1583462645508076/src/org/openbravo/erpCommon/ad_callouts/SL_User_Name.java#L82

Try run: One false positive, https://builds.openbravo.com/job/try-addpayment3-pgsql/775/ failed but https://builds.openbravo.com/job/try-addpayment3-oracle/774/ passed.