[iOS] [H1] Tel: Protocol Prompts

[stoletheminerals]

More info: https://hackerone.com/reports/3037223

[kjozwiak]

The above requires 1.78.70 or higher for 1.78.x verification 👍 @Uni-verse @hffvld please keep verification notes in https://github.com/brave/internal/issues/1271 similar to brave/brave-core#28284 (comment).