Remove Content-Type header while downloading droplets [main]

[gururajsh]

Description of the Change

Downloading a droplet from an S3 compatible storage using the command cf download-droplet and cf curl fails when Content-Type header is set in the request. So, removing it the header for this command.

Why Is This PR Valuable?

Allows users to download droplet from S3 compatible storage.

Applicable Issues

NA

How Urgent Is The Change?

NA

Other Relevant Parties

NA