Improve IP handling for default public and private interfaces

[Uni-verse]

Description

Currently we are exposing the local IP as well as the IPv6 address when selecting Default public and private interfaces under WebRTC IP handling policy in the privacy settings menu

Slack thread: https://bravesoftware.slack.com/archives/C6YNM6Y5S/p1681505519292369

Steps to Reproduce

1. Navigate to test page https://github.com/diafygi/webrtc-ips
2. Set WebRTC IP handling to Default public and private interfaces
3. Refresh page

Actual result:

Expected but we should improve to not expose IPv6 address

Expected result:

Should not expose IPv6 address

Reproduces how often:

Always

Desktop Brave version:

Brave	1.50.114 Chromium: 112.0.5615.49 (Official Build) (x86_64)
Revision	bd2a7bcb881c11e8cfe3078709382934e3916914-refs/branch-heads/5615@{#936}
OS	macOS Version 13.3.1 (Build 22E261)

Android Device details:

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet): All
• Android version: 13

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 nightly channel? Yes