Sometimes the rewards tour is initialized twice

[btlechowski]

This happens after user takes the tour through Take a quick tour and after the tour clicks Start using Brave Rewards

Note: the second tour can be skipped

Steps to Reproduce

1. Clean profile
2. Open Rewards Panel
3. Click Take a quick tour
4. Go through the tour
5. Click Start using Brave Rewards

Actual result:

The tour is initiated again

Expected result:

The tour is not initiated again

Reproduces how often:

100% repro rate

Brave version (brave://version info)

Brave	1.20.97 Chromium: 88.0.4324.96 (Official Build) dev (64-bit)
Revision	68dba2d8a0b149a1d3afac56fa74648032bcf46b-refs/branch-heads/4324@{#1784}
OS	Ubuntu 18.04 LTS

cc @zenparsing @rebron @brave/legacy_qa

[LaurenWags]

cc @codybanxs

[ghost]

I will create a new issue but in this case if a user goes through 'take a tour' and immediately goes through the 'Start using Brave Rewards' we should only show the last two slides that setup a users Rewards preferences for the second time.

[zenparsing]

Thanks @codybanxs ! No need to create a new issue, we can just use this one to track.