To the Review sites notification add a Dismiss button

Because you should always be able to dismiss a notification.

Auditors: @bsclifton

Test Plan:
(Similar to plan for #5296)

1. Trigger the "Payment in 24 hours, please review" notification.
  a. Update reconcileStamp to <24 hours from now
  b. Have sufficient funds; OR disable the sufficient funds conditional by adding false to ledger.js L1485 (showEnabledNotifications())
  c. Change startup notification delay in ledger.js L484 from 15m to 5s
2. Open Brave and observe 24h review notification
3. Close Brave and reopen. Notification should not reappear.
(Next 24h notification timestamp is set in Application Support/brave-development/session-store-1)

app/extensions/brave/locales/en-US/app.properties

@@ -167,6 +167,7 @@ flashExpirationText=Approvals reset 7 days after last visit.
 addFundsNotification=Your Brave Payments account is waiting for a deposit.
 reconciliationNotification=Good news! Brave will pay your favorite publisher sites in less than 24 hours.
 reviewSites=Review your chosen sites
+dismiss=Dismiss
 addFunds=Add funds
 notificationPasswordWithUserName=Would you like Brave to remember the password for {{username}} on {{origin}}?
 notificationPassword=Would you like Brave to remember your password on {{origin}}?

app/ledger.js

@@ -333,7 +333,8 @@ if (ipc) {
       }
     } else if (message === reconciliationMessage) {
       appActions.hideMessageBox(message)
-      if (win) {
+      // buttonIndex === 1 is Dismiss
+      if (buttonIndex === 0 && win) {
         win.webContents.send(messages.SHORTCUT_NEW_FRAME,
           'about:preferences#payments', { singleFrame: true })
       }
@@ -1532,7 +1533,8 @@ const showNotificationReviewPublishers = () => {
     greeting: locale.translation('updateHello'),
     message: reconciliationMessage,
     buttons: [
-      {text: locale.translation('reviewSites'), className: 'primary'}
+      {text: locale.translation('reviewSites'), className: 'primary'},
+      {text: locale.translation('dismiss')}
     ],
     options: {
       style: 'greetingStyle',

app/locale.js

@@ -205,6 +205,7 @@ var rendererIdentifiers = function () {
     'notificationTryPayments',
     'notificationTryPaymentsYes',
     'prefsRestart',
+    'dismiss',
     'yes',
     'no',
     'noThanks',