[MOB-637] Update new import wallet screen

[JDSM01]

What does this PR do?

Adds the import wallet from file option to the new import wallet screen

Database changed?

No

Where should the reviewer start?

ImportWalletFragment.kt

How should this be manually tested?

Test the import wallet flow through file and through keystore with and without password

What are the relevant tickets?

https://aptoide.atlassian.net/browse/MOB-637

Code Review Checklist

• [ ] Architecture
• [ ] Documentation on public interfaces
• [ ] Database changed?
• [ ] If yes - Database migration?
• [ ] Remove comments & unused code & forgotten testing Logs
• [ ] Codestyle
• [ ] Functional QA tests pass

[joaopmgouveia]

• [x] Hide keyboard after typing the password, when importing a wallet with keystore.