Rewards onboarding is behind the PB modals

[srirambv]

Description:

Rewards onboarding is behind the PB modals

Steps to Reproduce

1. Clean install Appstore build
2. Go to settings and set PB only
3. Upgrade to 1.13 and launch browser
4. Onboarding screen is hidden behind PB modals

Actual result:

Expected result:
Onboarding should be shown above app modals

Reproduces how often: [Easily reproduced, Intermittent Issue]
Easy

Brave Version:
1.12.1->1.13

Device details:
iPhone

Website problems only:

• did you check with Brave Shields down?
• did you check in Safari/Firefox (WkWebView-based browsers)?

Additional Information

[srirambv]

Verification passed on iPhone XR with iOS 13.2 running 1.14(19.11.20.19)

• Verified rewards onboarding is shown first after update
• Skipping/enabling rewards closes onboarding and then shows PB modals

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Verification passed on iPhone 7+ with iOS 13.2 running 1.14(19.11.20.19)

• Verified rewards onboarding is shown first after update
• Skipping/enabling rewards closes onboarding and then shows PB modals

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Verification passed on iPhone XR with iOS 13.2 running 1.14(19.11.20.19)

• Verified rewards onboarding is shown first after update
• Skipping/enabling rewards closes onboarding and then shows PB modals

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Verification passed on iPhone 6 with iOS 12.4 running 1.14(19.11.20.19)

• Verified rewards onboarding is shown first after update
• Skipping/enabling rewards closes onboarding and then shows PB modals

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Verification passed on iPad Pro with iOS 12.4 running 1.14(19.11.20.19)

• Verified rewards onboarding is shown first after update
• Skipping/enabling rewards closes onboarding and then shows PB modals