Wallet send address validation not checked after switching accounts

[StephenHeaps]

Description

During a send transaction, we validate to make sure the to address does not match the from address. After switching selected accounts, this validation is not re-checked which can allow the user to create a send transaction with a matching to/from address.

Steps to Reproduce

1. Open Send transaction panel
2. Copy address for Account 1
3. Enter a value to send, valid given current balance of token being sent in Account 1
4. Use account selector to select Account 2
5. Paste address for Account 1 in the 'to' field
6. Use account selector to select Account 1
7. Click 'send'
8. Observe from address and to address are the same in the Transaction Confirmation panel

Actual result:

validation.not.checked.after.account.change.1.mov

Expected result:

Validation for send to address is checked again when the selected account is changed

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Version 1.44.5 Chromium: 104.0.5112.69 (Official Build) nightly (arm64)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

[srirambv]

Verification passed on

Brave	1.46.70 Chromium: 107.0.5304.36 (Official Build) beta (64-bit)
Revision	2f9c7a5a1fe357d87e9bc07c65cca9136b3651c5-refs/branch-heads/5304@{#671}
OS	Linux

• Verified steps from issue description and brave/brave-core#15253
• Verified wallet address is verified when switching accounts

24325.mp4

---

Verification passed on

Brave	1.46.70 Chromium: 107.0.5304.36 (Official Build) beta (64-bit)
Revision	2f9c7a5a1fe357d87e9bc07c65cca9136b3651c5-refs/branch-heads/5304@{#671}
OS	Windows 11 Version 22H2 (Build 22621.674)

• Verified steps from issue description and brave/brave-core#15253
• Verified wallet address is verified when switching accounts

24325.mp4

---

Verification passed on

Brave	1.46.70 Chromium: 107.0.5304.36 (Official Build) beta (arm64)
Revision	2f9c7a5a1fe357d87e9bc07c65cca9136b3651c5-refs/branch-heads/5304@{#671}
OS	macOS Version 13.0 (Build 22A380)

• Verified steps from issue description and brave/brave-core#15253
• Verified wallet address is verified when switching accounts

24325.mov