Add custom sound form submits even without adding a file

[PriyaBihani]

Description:

When we try to add a custom sound in admin panel, the submit button gets enabled as soon as we enter a name. Making it possible for user to submit without uploading a file which results in an error "can not read property name of undefined".

Steps to reproduce:

1. Go to the admin panel
2. Go to custom sounds
3. Try to add a custom sound without name.

Expected behaviour:

Submit button should remain disabled until both name and file is added.

Actual behavior:

Button gets enabled as soon as a name is added thus making it possible to submit form.

Server Setup Information:

• Version of Rocket.Chat Server:
• Operating System:
• Deployment Method:
• Number of Running Instances:
• DB Replicaset Oplog:
• NodeJS Version:
• MongoDB Version:

Client Setup Information

• Desktop App or Browser Version:
• Operating System:

Additional context

Relevant logs:

[dougfabris]

Recently we did some refactoring in this section (#25128) and we added validation for the empty file as well.
Thanks a lot for your help @PriyaBihani