Normalize callback should exclude 0% publishers

[NejcZdovc]

Description

When you have publisher in your AC table that are 0% if normalize happens when you are on rewards page you will see them.

Steps to Reproduce

1. enable rewards
2. add a lot of publishers to the table so that you will have some publishers that has % 0
3. open rewards page and make sure that you don't see 0% publishers in AC table
4. open youtube video and let it run
5. go back to rewards page
6. wait there for 20s

Actual result:

AC list is updated and now you will see 0% publishers in the list

Expected result:

0% publishers should never be in the table

Reproduces how often:

100%

Brave version (brave://version info)

Version/Channel Information:

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

Other Additional Information:

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

Miscellaneous Information:

[LaurenWags]

Verified passed with

Brave	0.67.106 Chromium: 75.0.3770.100 (Official Build) beta(64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Mac OS X

• Verified test plan from Do not show 0% after normalization brave-core#2428

Verification passed on

Brave	0.67.108 Chromium: 75.0.3770.100 (Official Build) beta (64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• Verified test plan from Do not show 0% after normalization brave-core#2428

Verification passed on

Brave	0.67.110 Chromium: 75.0.3770.100 (Official Build) beta(64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Ubuntu 18.04 LTS

• Verified test plan from Do not show 0% after normalization brave-core#2428