Move Reset for wallet into BraveWalletService

[bbondy]

Currently the ResetWallet function is not usable from iOS.
This changes it so you only need to call reset on BraveWalletService.
It also fixes a bug with reloading a tab when not needed for restoring a wallet seed phrase.

QA test:

• Test that resetting the wallet reloads the wallet tab that is already open (if you have one open)
• Test that restoring seed phrase does not reload the active tab
• Test that adding a custom chain and switching to it, then resetting the wallet resets things back to normal

[srirambv]

Verification passed on Oppo Reno 5 with Android 11 running 1.36.85 x64 Beta build

• Verified steps from issue description
• Verified reset wallet closes the wallet window and goes back to tabs view when reset from within the wallet
• Verified reset wallet from settings closes the settings page and goes back to tabs view
• Verified custom networks are reset
• Verified added custom tokens are reset

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Verification passed on Samsung Tab A with Android 10 running 1.36.85 x64 Beta build

• Verified steps from issue description
• Verified reset wallet closes the wallet window and goes back to tabs view when reset from within the wallet
• Verified reset wallet from settings closes the settings page and goes back to tabs view
• Verified custom networks are reset
• Verified added custom tokens are reset

[srirambv]

Verification passed on

Brave	1.36.86 Chromium: 98.0.4758.87 (Official Build) beta (64-bit)
Revision	e4cd00f135fb4d8edc64c8aa6ecbe7cc79ebb3b2-refs/branch-heads/4758@{#1002}
OS	Linux

• Verified test plan from issue description
• Verified reset wallet reloads the existing wallet page
• Verified reset removes all custom tokens added
• Verified reset removes all custom networks that are added
• Verified auto-lock is also reset when wallet is reset but takes page reload to reflect changes
• Verified default base currency is reset when wallet is reset but takes page reload to reflect changes
• Encountered #20966

---

Verification passed on

Brave	1.36.86 Chromium: 98.0.4758.87 (Official Build) beta (64-bit)
Revision	e4cd00f135fb4d8edc64c8aa6ecbe7cc79ebb3b2-refs/branch-heads/4758@{#1002}
OS	Windows 11 Version Dev (Build 22543.1000)

• Verified test plan from issue description
• Verified reset wallet reloads the existing wallet page
• Verified reset removes all custom tokens added
• Verified reset removes all custom networks that are added
• Verified auto-lock is also reset when wallet is reset but takes page reload to reflect changes
• Verified default base currency is reset when wallet is reset but takes page reload to reflect changes
• Encountered #20966

---

Verification passed on

Brave	1.36.86 Chromium: 98.0.4758.87 (Official Build) beta (arm64)
Revision	e4cd00f135fb4d8edc64c8aa6ecbe7cc79ebb3b2-refs/branch-heads/4758@{#1002}
OS	macOS Version 12.1 (Build 21C52)

• Verified test plan from issue description
• Verified reset wallet reloads the existing wallet page
• Verified reset removes all custom tokens added
• Verified reset removes all custom networks that are added
• Verified auto-lock is also reset when wallet is reset but takes page reload to reflect changes
• Verified default base currency is reset when wallet is reset but takes page reload to reflect changes
• Encountered #20966