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.

(cherry picked from commit 8b2fe11d8491fb5f3b9bd7dd5344a0956817e41c)
(cherry picked from commit ec157b4a66)

src/saveload/economy_sl.cpp

@@ -102,7 +102,7 @@ static void Ptrs_CAPY()
 
 extern const ChunkHandler _economy_chunk_handlers[] = {
 	{ 'CAPY', Save_CAPY,     Load_CAPY,     Ptrs_CAPY, NULL, CH_ARRAY},
-	{ 'PRIC', NULL,          Load_PRIC,     NULL,      NULL, CH_RIFF | CH_AUTO_LENGTH},
-	{ 'CAPR', NULL,          Load_CAPR,     NULL,      NULL, CH_RIFF | CH_AUTO_LENGTH},
+	{ 'PRIC', NULL,          Load_PRIC,     NULL,      NULL, CH_RIFF },
+	{ 'CAPR', NULL,          Load_CAPR,     NULL,      NULL, CH_RIFF },
 	{ 'ECMY', Save_ECMY,     Load_ECMY,     NULL,      NULL, CH_RIFF | CH_LAST},
 };