[Android] Update reward flag for status

[deeppandya]

Description

Update rewards code based on https://bravesoftware.slack.com/archives/CB0KCRCQN/p1594836766343800

Steps to reproduce

1. Enable rewards from the panel
2. Open SI New tab page

Actual result

NTP with SI doesn't show bottom banner

Expected result

NTP with SI should show bottom banner for the first time

Issue reproduces how often

Often

Issue happens on

• Current Play Store version?
• Beta build? Yes

Device details

• Install type (ARM, x86):
• Device (Phone, Tablet, Phablet):
• Android version:

Brave version

Website problems only

• 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?

Additional information