zaps: don't verify deschash

seems like most clients don't do this and apparently simplfies some
zapper implementations. It's not a huge deal for us since people can
fake bolt11s anyways.

Suggested-by: bumi, calle
Link: 20240418230321.1907519-1-jb55@jb55.com
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Util/Zap.swift

@@ -411,9 +411,6 @@ func get_zap_description(_ ev: NostrEvent, inv_desc: InvoiceDescription) -> Stri
         guard let data = desc.data(using: .utf8) else {
             return nil
         }
-        guard sha256(data) == deschash else {
-            return nil
-        }
         
         return desc
     }