Refactor all .length === 0 patterns in JS (#30045)

This pattern comes of often during review, so let's fix it once and for
all. Did not test, but changes are trivial enough imho.

web_src/js/components/RepoActionView.vue

@@ -453,7 +453,7 @@ export function initRepositoryActionView() {
                   {{ locale.showFullScreen }}
                 </a>
                 <div class="divider"/>
-                <a :class="['item', currentJob.steps.length === 0 ? 'disabled' : '']" :href="run.link+'/jobs/'+jobIndex+'/logs'" target="_blank">
+                <a :class="['item', !currentJob.steps.length ? 'disabled' : '']" :href="run.link+'/jobs/'+jobIndex+'/logs'" target="_blank">
                   <i class="icon"><SvgIcon name="octicon-download"/></i>
                   {{ locale.downloadLogs }}
                 </a>