[118][Discounts] Bug bash polish work

This CL fixes the following:
  * Updates the header image that has additional top spaces
  * Updates the top content padding for the GM3 version

(cherry picked from commit 301b688)

Bug: 1480833
Change-Id: Ida2b099b1677ecffdcf66fb53f1c927ab1bcf161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4889935
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Commit-Queue: Mei Liang <meiliang@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1201751}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4908639
Auto-Submit: Mei Liang <meiliang@chromium.org>
Reviewed-by: Emily Shack <emshack@chromium.org>
Commit-Queue: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/branch-heads/5993@{#1101}
Cr-Branched-From: 5113507-refs/heads/main@{#1192594}

chrome/browser/ui/views/autofill/payments/offer_notification_bubble_views.cc

@@ -175,6 +175,9 @@ void OfferNotificationBubbleViews::InitWithFreeListingCouponOfferContent() {
   std::u16string promo_code_value_prop_string;
 
   if (::features::IsChromeRefresh2023()) {
+    set_margins(ChromeLayoutProvider::Get()->GetDialogInsetsForContentType(
+        views::DialogContentType::kControl, views::DialogContentType::kText));
+
     const int dialog_inset = views::LayoutProvider::Get()
                                  ->GetInsetsMetric(views::INSETS_DIALOG)
                                  .left();

chrome/browser/ui/views/autofill/payments/offer_notification_icon_view_browsertest.cc

@@ -65,6 +65,7 @@ class OfferNotificationIconViewBrowserTest : public UiBrowserTest {
     if (!offer_notification_icon_view) {
       return false;
     }
+
     EXPECT_EQ(offer_notification_icon_view->GetAccessibleName(),
               l10n_util::GetStringUTF16(
                   IDS_AUTOFILL_OFFERS_REMINDER_ICON_TOOLTIP_TEXT));