settings: mark product logo as presentational

Bug: 1009128
Change-Id: I9736ed491bc8f4378129411ec1f212e7bbd131c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880538Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710172}

chrome/browser/resources/settings/about_page/about_page.html

@@ -95,7 +95,8 @@
             <img id="product-logo" on-click="onProductLogoTap_"
                 srcset="chrome://theme/current-channel-logo@1x 1x,
                         chrome://theme/current-channel-logo@2x 2x"
-                alt="$i18n{aboutProductLogoAlt}">
+                alt="$i18n{aboutProductLogoAlt}"
+                role="presentation">
             <h1 class="product-title">$i18n{aboutProductTitle}</h1>
           </div>
           <div class="settings-box two-line">