can't disable content-level tips

[LaurenWags]

Description

Unable to disable content-level tips.

Steps to Reproduce

1. Install twitter tip enabled nightly.
2. Enable Rewards
3. Navigate to brave://rewards page
4. Click on settings in Tips panel.
5. Try to uncheck Twitter.

Actual result:

Unable to uncheck Twitter.

Expected result:

Able to uncheck Twitter.

Reproduces how often:

easily

Brave version (brave://version info)

Brave	0.67.55 Chromium: 75.0.3770.38 (Official Build) nightly(64-bit)
Revision	3860105745f2b12537da9e9f048f14c3f52ba970-refs/branch-heads/3770@{#618}
OS	Mac OS X

Version/Channel Information:

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

Other Additional Information:

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

Miscellaneous Information:

cc @brave/legacy_qa @mandar-brave @alexwykoff @jenn-rhim

[emerick]

@NejcZdovc I think the problem is in the ON_INLINE_TIP_SETTINGS_CHANGE reducer, where it makes this check:

if (!value || value === '') {
  break
}

Seems like that will prevent a false value from ever being allowed...

[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 STR above and test plan from Fixes setting twitter inline tip setting brave-core#2503
• Verified when Twitter box is unchecked, the inline tip button does not display on a twitter page, i.e. twitter.com/brave
  
  

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 the test plan from Fixes setting twitter inline tip setting brave-core#2503
• Verified the STR from the description
• Verified that when the Twitter checkbox is unchecked in tips settings, in-line Tip option won't be available in twitter feeds
  

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	Linux

• Verified the test plan from Fixes setting twitter inline tip setting brave-core#2503
• Verified the STR from the description
• Verified that when the Twitter checkbox is unchecked in tips settings, in-line Tip option won't be available in twitter feeds