Cleanup: Remove save-only autolength flag from economy chunk handlers

CH_AUTO_LENGTH is only used when saving chunks; it makes no sense
to set it for chunks without a save handler.

src/saveload/economy_sl.cpp

@@ -98,7 +98,7 @@ static void Ptrs_CAPY()
 
 extern const ChunkHandler _economy_chunk_handlers[] = {
 	{ 'CAPY', Save_CAPY,     Load_CAPY,     Ptrs_CAPY, nullptr, CH_ARRAY},
-	{ 'PRIC', nullptr,       Load_PRIC,     nullptr,   nullptr, CH_RIFF | CH_AUTO_LENGTH},
-	{ 'CAPR', nullptr,       Load_CAPR,     nullptr,   nullptr, CH_RIFF | CH_AUTO_LENGTH},
+	{ 'PRIC', nullptr,       Load_PRIC,     nullptr,   nullptr, CH_RIFF },
+	{ 'CAPR', nullptr,       Load_CAPR,     nullptr,   nullptr, CH_RIFF },
 	{ 'ECMY', Save_ECMY,     Load_ECMY,     nullptr,   nullptr, CH_RIFF | CH_LAST},
 };