Move 'Show Brave Rewards icon in...' toggle to BR pane so all BR related controls are in one place

[jenn-rhim]

[Miyayes]

One funny edge case is this:

If user has not yet enabled Brave Rewards, then this is what the Brave Rewards section of brave://settings looks like:

So, they wouldn't be able to access it without first enabling Brave Rewards (which they might not want to do).

That said, maybe that's acceptable now that we introduced a right-click hide on the BAT icon itself?

@jenn-rhim ^^

[rebron]

@Miyayes The show/hide Brave Rewards icon setting could still live separately in the Brave Rewards section when Brave Rewards are disabled. Could have the setting sit on top or below what's shown there.

[Miyayes]

@Miyayes The show/hide Brave Rewards icon setting could still live separately in the Brave Rewards section when Brave Rewards are disabled. Could have the setting sit on top or below what's shown there.

That's a good point. We will plop it in as an item under the "Brave Rewards are disabled" section, then. Thanks!

[MadhaviSeelam]

Verification PASSED using

Brave | 1.44.73 Chromium: 105.0.5195.68 (Official Build) beta (64-bit)
-- | --
Revision | ad13e82529051bac6a0e65f455e6d7a1e5fd7938-refs/branch-heads/5195@{#903}
OS | Windows 11 Version 21H2 (Build 22000.856)

Case 1: Rewards disabled - PASSED

Clean profile:

1. Install 1.44.73
2. launch Brave
3. Do not enable rewards
4. open brave://settings/rewards

Confirmed Show Brave Rewards icon in address bar setting shown in brave://settings/rewards and the ON/OFF toggle functionality works as expected

toggle OFF	toggle ON

Upgrade Upgrade 1.43.88-->1.44.73

1. Install 1.43.88
2. enable Rewards
3. Show Brave Rewards icon in address bar is available and enabled in brave://settings/appearance
4. toggle OFF for Show Brave Rewards icon in address bar
5. close the browser
6. rename profile
7. install 1.44.73
8. launch Brave
9. open brave://settings/rewards

Confirmed Show Brave Rewards icon in address bar setting shown in brave://settings/rewards and the toggle 'OFF` setting retained.

Step 3	Step 4	Step 9

Case 2: Rewards enabled - PASSED

Clean profile

1. clean profile
2. enable Rewards
3. open brave://settings/rewards

Confirmed Show Brave Rewards icon in address bar setting shown in brave://settings/rewards and the ON/OFF toggle functionality works as expected

toggle ON	toggle OFF

Upgrade 1.43.88-->1.44.73 - PASSED

1. Install 1.43.88
2. Enable Rewards
3. Show Brave Rewards icon in address bar is available and enabled in brave://settings/appearance`
4. leave toggle ON for Show Brave Rewards icon in address bar
5. close the browser
6. rename profile
7. install 1.44.73
8. launch Brave
9. open brave://settings/rewards

Confirmed Show Brave Rewards icon in address bar setting moved from brave://settings/appearance to brave://settings/rewards and the toggle 'ON` setting retained.

Step 3	Step 9