[iOS][hackerone] Fix url formatting

[stoletheminerals]

• See https://hackerone.com/reports/2790405
• See https://hackerone.com/reports/2792681

@Uni-verse @hffvld STR/Cases can be found via https://github.com/brave/internal/issues/1210#issue-2598705116.

[kjozwiak]

Verification PASSED on iPhone 12 running iOS 18 using the following build(s):

Brave | 1.70.131 Chromium: 129.0.6668.100 (Official Build) stable (64-bit) 
--- | ---
Revision | 12c872a5da009a5c488a97d7c3b66f526e97bad6
OS | iOS

Verification notes for the above can be found via https://github.com/brave/internal/issues/1210#issuecomment-2433259961.

---

Verification PASSED on iPhone 14 running iOS 17.7 using the following build(s):

Brave | 1.70.131 Chromium: 129.0.6668.100 (Official Build) stable (64-bit) 
--- | ---
Revision | 12c872a5da009a5c488a97d7c3b66f526e97bad6
OS | iOS

Verification notes for the above can be found via https://github.com/brave/internal/issues/1210#issuecomment-2433373450.

---

Verification PASSED on iPad Air (3rd Gen) running iOS 18 using the following build(s):

Brave | 1.70.131 Chromium: 129.0.6668.100 (Official Build) stable (64-bit) 
--- | ---
Revision | 12c872a5da009a5c488a97d7c3b66f526e97bad6
OS | iOS

Verification notes for the above can be found via https://github.com/brave/internal/issues/1210#issuecomment-2433388282 & https://github.com/brave/internal/issues/1210#issuecomment-2433373450.