[Bug Report] Cancelling can take a long time with slow Wi-Fi

[Epicpkmn11]

Describe the bug
When downloading, if it should cancel is only checked when writing to the file, this means that if your Wi-Fi speed is being terrible it can take a long time to cancel.

To Reproduce
Steps to reproduce the behavior:

1. Have slow Wi-Fi
2. Download something
3. Click cancel

Expected behavior
Cancelling quickly interrupts cURL somehow or other.

Console/Version (please complete the following information):
N/A

Universal-Updater (please complete the following information):

• Release v3.2.2

If Release -> version [example: v2.2.0]

• Nightly

If Nightly -> Commit hash [example: a10b9da]

How do you launch it:

• cia
• 3dsx

Additional context
Reported by @lifehackerhansol on Discord.