BAT Confirmations should not be started if Rewards is disabled

[LaurenWags]

Description:

Logging per brave/brave-core#5424

Above PR fixes brave/brave-browser#9544 and per the PR it should also be checked on iOS.

See above issue/PR for more information.

cc @srirambv

Additional Information

cc @kylehickinson to review and place in appropriate milestone as this code might already be in iOS

[kylehickinson]

Code is already in iOS as our current BraveRewards framework is built off of 1.10.52 and this was merged at 1.10.28, meaning its already shipping in 1.17. This milestone is closed however so I can't add it to that. @LaurenWags Do you want me to add it to 1.18 to test in iOS or fine to leave it?

Here is the PR that merged this change inadvertently: #2566

[LaurenWags]

let's test with next iOS release that goes out unless @srirambv feels differently 👍