Dismiss or close button is missing in grants notification in NTP widget

[GeetaSarvadnya]

Description

Found while testing #15146

Unable to dismiss the UGP grants notification from NTP widget as there is no x close button in 1.37.x but it exists in 1.36.x. If there is an Ad grant waiting to be claimed, the ad grants notification will not be shown on the NTP widget until UGP grants is claimed

Steps to Reproduce

1. Clean profile 1.37.x staging env
2. Enable rewards
3. Open an NTP
4. Dismiss or close button is missing in grants notification in NTP widget

Actual result:

Dismiss or close button is missing in grants notification in NTP widget

Expected result:

Dismiss or close button should be present in the grants notification in NTP widget

1.36.x

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.37.87 Chromium: 99.0.4844.51 (Official Build) beta (64-bit)
Revision	d537ec02474b5afe23684e7963d538896c63ac77-refs/branch-heads/4844@{#875}
OS	Windows 10 Version 21H2 (Build 19044.1586)

## Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta 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 @Miyayes @zenparsing @LaurenWags

[zenparsing]

One solution might be to prioritize Ad grants over UGP grants in this display.

[Miyayes]

Given that:

1. There is a workaround (you can get around this in other parts of the UI, such as Rewards settings page, and perhaps Rewards panel)

2. It would be better to avoid more design resources on UI/UX handling of this and adding an x

We should just:

One solution might be to prioritize Ad grants over UGP grants in this display.

Seems like a simple, clean solution.