Transform test results to normalize away an insignificant difference

Per our [discussion](http://www.w3.org/XML/XProc/2014/08/20-minutes#item06) at the XProc WG meeting of 20 Aug 2014, the use of quoted parameters is legal. However, the quoting is entirely optional for a parameter like "utf-8" that consists of a single token.

The patch proposed in this pull request simply normalizes away the difference. It makes no substantive change to the test.