Resolve GlAvatar size in commit item

Update the avatar size in commit modal so it is compatible with GlAvatar
when the gl_avatar_for_all_user_avatars
feature flag is enabled.

app/assets/javascripts/diffs/components/commit_item.vue

@@ -130,7 +130,7 @@ export default {
             :link-href="authorUrl"
             :img-src="authorAvatar"
             :img-alt="authorName"
-            :img-size="40"
+            :img-size="32"
             class="avatar-cell d-none d-sm-block"
           />
         </div>

spec/frontend/diffs/components/commit_item_spec.js

@@ -80,7 +80,7 @@ describe('diffs/components/commit_item', () => {
       const imgElement = avatarElement.find('img');
 
       expect(avatarElement.attributes('href')).toBe(commit.author.web_url);
-      expect(imgElement.classes()).toContain('s40');
+      expect(imgElement.classes()).toContain('s32');
       expect(imgElement.attributes('alt')).toBe(commit.author.name);
       expect(imgElement.attributes('src')).toBe(commit.author.avatar_url);
     });