COCOON-2063: Fix encoding issue in NekoHTMLGenerator when reading a request parameter value.

Files:
modified: /cocoon/trunk/blocks/cocoon-html/cocoon-html-impl/src/changes/changes.xml (try)
modified: /cocoon/trunk/blocks/cocoon-html/cocoon-html-impl/src/main/java/org/apache/cocoon/generation/NekoHTMLGenerator.java (try)