Replace Incognito to Tor for download warning message

[srirambv]

Description

Replace Incognito to Tor for download warning message

Steps to Reproduce

1. Download a file in Tor window
2. Close the window while download is in progress
3. Warning message shows Incognito instead of Tor

Actual result:

Expected result:

Proper naming convention to be used for specific window types

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	0.66.101 Chromium: 75.0.3770.142 (Official Build) (64-bit)
Revision	8d93477bd18154c67a70a67019cb8032382c55dd-refs/branch-heads/3770@{#1160}
OS	Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N/A
• Does the issue resolve itself when disabling Brave Rewards? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Miscellaneous Information:

[kjozwiak]

Looks like macOS uses Quit private mode anyway?

We need to use the same wording across the different platforms. I'm not sure if Quit private mode is correct or it should mention Quit Tor mode as @srirambv mentioned above.

[tildelowengrimm]

Text should be

Closing this private window with Tor will cancel this download.
[Continue download] [Cancel download and exit]