P3A - Open TOR window response value isn't displayed correctly in Upgraded profile

[GeetaSarvadnya]

Description

Found while testing #6285
P3A - Open TOR window response value isn't displayed correctly in Upgraded profile
Q10: Have you ever used a Tor private window?
(Brave.Core.LastTimeIncognitoUsed)

1. Yes
2. No

Steps to Reproduce

1. Clean profile 1.0.1
2. Open a TOR window
3. Upgrade profile to 1.1.18
4. Reload local state
5. Open TOR window response value is displayed as 1 instead of 0 in local state file

Actual result:

Open TOR window response value is displayed as 1 instead of 0

Expected result:

Open TOR window response value should be displayed correctly

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.1.18 Chromium: 79.0.3945.56 (Official Build) (64-bit)
Revision	73cc6bf591f792b99f8fc7cdfb8addedbd084bf8-refs/branch-heads/3945@{#788}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

cc: @brave/legacy_qa @iefremov @bsclifton @rebron