[ProfileAvatarSelector]: Fix offset for avatar icon tooltip.

Bug: 1168430
Change-Id: I0f19d50fac9efd5d4d6833d8a26c1b4408977984
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640118Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845243}

ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector.html

@@ -82,7 +82,7 @@
             aria-checked$="[[getCheckedAttribute_(item, selectedAvatar)]]">
         </cr-button>
         <paper-tooltip for="[[getAvatarId_(index)]]"
-            offset="-12" fit-to-visible-bounds>
+            offset="0" fit-to-visible-bounds>
           [[item.label]]
         </paper-tooltip>
       </template>