fix: sub-validate message structs

crates/delta/src/routes/channels/message_edit.rs

@@ -71,6 +71,10 @@ pub async fn req(
         new_embeds.clear();
 
         for embed in embeds {
+            embed
+                .validate()
+                .map_err(|error| Error::FailedValidation { error })?;
+
             new_embeds.push(embed.clone().into_embed(db, message.id.clone()).await?);
         }
     }