FOTS driver: serialization error in the outputed test case

[Sorin Marian Nasoi]

The query_.xq that is created by the "run-test-case" is not serialized correctly in some cases.

Here is an example:
zorba "-f" "-q" "../../fots_driver/cli.xq" "-e" "mode:=run-test-case" "-e" "testSetName:=fn-matches.re" "-e" "expectedFailuresPath:=/home/ceej/zo/src/build/FOTSExpectedFailures.xml" "-e" "verbose:=true" "--disable-http-resolution" "--indent" "-z" "cdata-section-elements=fots:query test assert-xml" -e testCaseName:=re00127a

the content of query_re00127a.xq is wrong.