Ads shows region not supported on upgrade

[ryanml]

For upgrade paths from <0.63.x, the Ads panel shows that the Region is not supported, but then when the page is reloaded, it correctly does.

It should show that the Region is correctly supported on first load.

[srirambv]

Verification passed on

Brave	0.63.46 Chromium: 74.0.3729.91 (Official Build) (64-bit)
Revision	03844ed83e02b8add3f4b9cb859a7108d55b2e4d-refs/branch-heads/3729@{#860}
OS	Linux

• Verified test plan from Fix Shows supported region correctly for Ads on first load after upgrade. brave-core#2263

Verification passed on

Brave	0.63.46 Chromium: 74.0.3729.91 (Official Build) (64-bit)
Revision	03844ed83e02b8add3f4b9cb859a7108d55b2e4d-refs/branch-heads/3729@{#860}
OS	Windows 10 OS Build 17134.523

• Verified test plan from Fix Shows supported region correctly for Ads on first load after upgrade. brave-core#2263

• when upgraded from 0.62.51 to 0.63.46 ensured that Ads is disabled and unsupported message is NOT shown for Ads supported country.
  
• when upgraded from 0.62.51 to 0.63.46 ensured that Ads is disabled and unsupported message is shown for non supported country.

Verified passed with

Brave	0.63.46 Chromium: 74.0.3729.91 (Official Build) (64-bit)
Revision	03844ed83e02b8add3f4b9cb859a7108d55b2e4d-refs/branch-heads/3729@{#860}
OS	Mac OS X

• Verified test plan from Fix Shows supported region correctly for Ads on first load after upgrade. brave-core#2263

• Verified that on update from 0.62.51 --> 0.63.46 supported regions (US, Can, UK, FR, DE) had Ads off by default and did not show the 'Sorry' message.
  
  

• Verified that on upgrade from 0.62.51 --> 0.63.46 non-supported regions (tested with Sweden, Australia, Brazil), did not show toggle to enable Ads and did show the 'Sorry' message (in English which is expected at this time).