fix: remove optional chaining (#122)

It's not supported in some environments - jest, etc.

Author: achingbrain

migrations/migration-9/pin-set.js

@@ -237,7 +237,7 @@ function storeItems (blockstore, items) {
 
       await blockstore.put(cid, buf)
 
-      let size = child.Links.reduce((acc, curr) => acc + (curr?.Tsize || 0), 0) + buf.length
+      let size = child.Links.reduce((acc, curr) => acc + (curr.Tsize || 0), 0) + buf.length
 
       fanoutLinks[binIdx] = {
         Name: '',