Bugfix: A lone quote inside quotes should not be escaped for FSS Basic and Extended.

Bugfix: A lone quote inside quotes should not be escaped for FSS Basic and Extended.

The command and results:
  # fss_extended_write -oc "'" '"' -oc '"' "'" -oc ' `' "\` " -oc "'" "'" | fss_extended_read -oc
  ' \"
  \" '
  ` `
  ' '

Is incorrect.
The correct results should be:
  # fss_extended_write -oc "'" '"' -oc '"' "'" -oc ' `' "\` " -oc "'" "'" | fss_extended_read -oc
  ' "
  " '
  ` `
  ' '

The problem is that in the case where the quote is already within a quoted string then it should not be escaped.
This only applies for the quote that would not be a valid closing quote.