Fix AVM header parsing (#1931)

src/obu.c

diff --git a/src/obu.c b/src/obu.c
index 4a9035a..9389e9d 100644
--- a/src/obu.c
+++ b/src/obu.c
@@ -381,7 +381,7 @@
 #if CONFIG_LR_IMPROVEMENTS
         avifBitsRead(bits, /*RESTORE_SWITCHABLE_TYPES=*/5); // lr_tools_disable_mask[0]
         if (avifBitsRead(bits, 1)) {
-            avifBitsRead(bits, /*RESTORE_SWITCHABLE_TYPES=*/5 - 1); // lr_tools_disable_mask[1]
+            avifBitsRead(bits, /*RESTORE_SWITCHABLE_TYPES=*/5 - 1 - 1); // lr_tools_disable_mask[1]
         }
 #endif
     }