Create MacOS volume icons for both the privacy browser and Tor Browser

Tor Browser currently uses the default macOS volume icon rather than something custom. Both browsers should use a version of the default MacOS volume icon with their respective application icons imprinted on it instead, which is the norm for third-party software. I think a monotone debossed effect would look great for both.

Here are some other third-party volume icons, for reference:

• Firefox: Firefox volume icon
• Brave: Brave volume icon
• Chrome: Chrome volume icon
• Vivaldi: Vivaldi volume icon