Fix CGIFormData to actually store file-upload part content

File-upload parts (Content-Disposition with filename=) were
unconditionally flagged currentSkip and discarded at PART_BOUNDARY,
so every <field type="file"> upload site (track audio, presets,
project icons) only ever received an empty value via $[fieldname],
never the real uploaded bytes.

CGIFormData.h

@@ -59,7 +59,6 @@ namespace coreutils {
       IMFHeader *headerParser = NULL;
       IMFBoundary *boundaryParser = NULL;
       MString currentName;
-      bool currentSkip = false;
       std::map<MString, int> nameCounts;
 
       void extractPartName(IMFHeader &header);