Collapse dusk.dsk from two zip archives into one, all uncompressed

Bulk assets (mp3, png) are already compressed at the file level, so a
DEFLATE pass on top bought negligible space for real CPU cost. Packs
everything into a single ZIP_STORED archive instead, so every entry
(not just locale/*) gets the reliable repeated seeking/re-opening that
libzip only supports for uncompressed entries. Header shrinks from 32
to 16 bytes; version bumped to 2 so a stale pre-change dusk.dsk is
rejected and rebuilt rather than misread.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/duskpsp/asset/assetpbp.c

@@ -80,8 +80,7 @@ errorret_t assetInitPBP(const char_t *pbpPath) {
     pbpPath,
     ASSET.platform.pbpHeader.psarOffset,
     psarSize,
-    &ASSET.zip,
-    &ASSET.zipStored
+    &ASSET.zip
   ));
 
   errorOk();