Add achievement icon padding

What does this MR do and why?

Add some padding in the user achievement icon.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

• Run the achievements seed script: bundle exec rake db:seed_fu FILTER=36_achievements
• Enable the feature flag in the rails console: Feature.enable(:achievements)
• Visit http://gdk.test:3000/root

If you have any problems, try deleting all achievements from the rails console: Achievements::Achievement.delete_all then re-running the seed script (not from the rails console): bundle exec rake db:seed_fu FILTER=36_achievements

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

app/assets/javascripts/profile/components/user_achievements.vue

@@ -69,7 +69,7 @@ export default {
         :src="userAchievement.avatarUrl"
         :alt="''"
         tabindex="0"
-        class="gl-avatar gl-avatar-s32 gl-mx-2"
+        class="gl-avatar gl-avatar-s32 gl-mx-2 gl-p-1 gl-border-none"
       />
       <gl-popover triggers="hover focus" placement="top" :target="userAchievement.id">
         <div class="gl-font-weight-bold">{{ userAchievement.name }}</div>