Fix incorrect ending offsets for looping chunks

patterns/db_files/chunks/BRLIST.hexpat

@@ -9,7 +9,8 @@ using BrMedia;
 using BrType;
 
 struct BrList {
-    Br brushes[while($ < brlist_toc.offset + brlist_toc.size)];
+    u32 max = get_end(toc, parent.header.name);
+    Br brushes[while($ < max)];
 };
 
 // There's one core struct here, but fields are used differently for non-terrain brushes

patterns/db_files/chunks/OBJ_MAP.hexpat

@@ -9,5 +9,6 @@ struct ObjMapElement {
 };
 
 struct ObjMap {
-    ObjMapElement objects[while($ < objmap_toc.offset + objmap_toc.size)];
+    u32 max = get_end(toc, parent.header.name);
+    ObjMapElement objects[while($ < max)];
 };

patterns/db_files/chunks/ScrModules.hexpat

@@ -9,6 +9,7 @@ namespace ScrModules {
     };
 
     struct ChunkData {
-        Name names[while($ < scrmodules_toc.offset + scrmodules_toc.size)];
+        u32 max = get_end(toc, parent.header.name);
+        Name names[while($ < max)];
     };
 }