text update needed on Dashboard Settings

[LaurenWags]

Description

Per the spec for SNTP, Show Background Image should be updated to Show Background Images.

Steps to Reproduce

1. Clean profile
2. Enable SNTP from flags, relaunch
3. Open Dashboard Settings on NTP

Actual result:

Expected result:

Should say Show Background Images

Reproduces how often:

easily

Brave version (brave://version info)

Brave	1.5.62 Chromium: 79.0.3945.130 (Official Build) nightly (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	macOS Version 10.14.6 (Build 18G103)

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? yes

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:

cc @brave/legacy_qa @rebron @petemill

[gupta437]

If no one is working actively on this issue, Can I take this issue to work on?

[bsclifton]

@gupta437 it's all yours! 😄 Let me know if you need help finding where it's stored

[0xedward]

Hey @gupta437, are you still working on this? If not, I would love to give this a try!

[bsclifton]

@edwardqiu go for it 😄

[0xedward]

Hi @bsclifton, this is my first time opening a PR here! Please let me know if there's anything I should change 😄

[kjozwiak]

Verification PASSED on macOS 10.15.6 x64 using the following build:

Brave | 1.15.55 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
-- | --
Revision | ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS | macOS Version 10.15.6 (Build 19G73)

• ensured that Customize --> Background Images under NTP displays Show Background Images when enabled & disabled
• double checked and ensured that brave://settings/newTab displays the correct strings

Dashboard Settings	brave://settings

---

Verification passed on

Brave | 1.15.56 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
-- | --
Revision | ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS | Windows 10 OS Version 1903 (Build 18362.1016)

• ensured that Customize --> Background Images under NTP displays Show Background Images when enabled & disabled
• double checked and ensured that brave://settings/newTab displays the correct strings

Dashboard Settings	brave://settings

Verification passed on

Brave	1.15.56 Chromium: 85.0.4183.102 (Official Build) dev (64-bit)
Revision	ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS	Ubuntu 18.04 LTS

• ensured that Customize --> Background Images under NTP displays Show Background Images when enabled & disabled
• double checked and ensured that brave://settings/newTab displays the correct strings

Dashboard Settings	brave://settings