[MOB-616] - Added payment methods icons to onboarding.

[FredericoSantinho]

What does this PR do?

Added payment methods icons to onboarding.

Database changed?

No

Where should the reviewer start?

• [ ] OnboardingActivity.kt

How should this be manually tested?

Open the wallet for the first time to see the onboarding screen. In the third page, payment methods icons should be shown.

What are the relevant tickets?

Tickets related to this pull-request: MOB-616

Questions:

Does this add new dependencies which need to be added? (Eg. new libs, new keys, etc.)

No

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