Wallet: Send Screen auto-dismissed

[nuo-xu]

Description:

if you go to Buy/Send/Swap Screen from asset detail, those screens will auto-dismissed

1. if you change selected account
2. if you change your selected network
3. if asset detail finishes loading at the background

Steps to Reproduce

1. open brave wallet
2. go to any asset detail
3. click either buy/send/swap
4. click account picker
5. change to another account

Actual result:
account list will dismiss, and right after, buy/send/swap screen will be dismissed as well

Expected result:
should stay at buy/send/swap screen

Reproduces how often: [Easily reproduced]

[srirambv]

Verification passed on iPhone 7+ with iOS 14.8.1 running 1.45.2 (22.11.23.16)

• Verified steps from issue description and #6463
• Verified send screen doesn't auto-dismiss when selecting Send form portfolio or token details screen
• Verified send screen doesn't auto-dismiss for NFT or Tokens

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Verification passed on iPhone XR with iOS 14.8.1 running 1.45.2 (22.11.23.16)

• Verified steps from issue description and #6463
• Verified send screen doesn't auto-dismiss when selecting Send form portfolio or token details screen
• Verified send screen doesn't auto-dismiss for NFT or Tokens

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Verification passed on iPad Pro with iOS 16.1 running 1.45.2 (22.11.23.16)

• Verified steps from issue description and #6463
• Verified send screen doesn't auto-dismiss when selecting Send form portfolio or token details screen
• Verified send screen doesn't auto-dismiss for NFT or Tokens