Improve spacing between page action buttons

What does this MR do and why?

Spacing looked wrong on these action buttons because the dropdown has a variant of "tertiary" instead of the default which removed its border and background, this MR sets the variant to default. Here is a link to the section in figma that describes this issue: https://www.figma.com/design/ZlkUgJPyWSqPYkwzHHECPw?node-id=12-105#1099960889

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Related to #509381 (closed)

app/assets/javascripts/pages/shared/wikis/components/wiki_more_dropdown.vue

@@ -103,7 +103,6 @@ export default {
   <gl-disclosure-dropdown
     v-gl-tooltip="showDropdownTooltip"
     icon="ellipsis_v"
-    category="tertiary"
     placement="bottom-end"
     no-caret
     data-testid="wiki-more-dropdown"