fix(picompress): pass correct source size to uncompress()

piDecompress() appended original size as 8-byte ullong at the end
of compressed data, but passed zba.size() (including the 8 bytes)
to uncompress(). This fed trailing metadata as part of the zlib
stream. Fix: subtract sizeof(ullong) from source length.

libs/compress/picompress.cpp

@@ -68,7 +68,7 @@ PIByteArray piDecompress(const PIByteArray & zba) {
 	ba.resize(sz);
 	int ret = 0;
 	ulong s = sz;
-	ret     = uncompress(ba.data(), &s, zba.data(), zba.size());
+	ret     = uncompress(ba.data(), &s, zba.data(), zba.size() - sizeof(ullong));
 	if (ret != Z_OK) {
 		piCout << "[PICompress]"
 			   << "Error: invalid input or not enought memory"_tr("PICompress");