Fixes pagination not always working in merge request dashboard

What does this MR do and why?

Fixes a bug where sometimes the load more button would not show the extra merge requests.

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app/assets/javascripts/merge_request_dashboard/components/collapsible_section.vue

@@ -75,7 +75,7 @@ export default {
             @click="toggleOpen"
           />
           {{ title }}
-          <gl-badge v-if="!loading" class="gl-ml-1" variant="neutral" size="sm">{{
+          <gl-badge v-if="!loading || count" class="gl-ml-1" variant="neutral" size="sm">{{
             count
           }}</gl-badge>
         </h5>