Fix variable usage

app/assets/javascripts/cycle_analytics/components/stage_staging_component.js.es6

@@ -25,7 +25,7 @@
                     <path fill="#8C8C8C" fill-rule="evenodd" d="M9.678 6.722C9.353 5.167 8.053 4 6.5 4S3.647 5.167 3.322 6.722h-2.6c-.397 0-.722.35-.722.778 0 .428.325.778.722.778h2.6C3.647 9.833 4.947 11 6.5 11s2.853-1.167 3.178-2.722h2.6c.397 0 .722-.35.722-.778 0-.428-.325-.778-.722-.778h-2.6zM4.694 7.5c0-1.09.795-1.944 1.806-1.944 1.01 0 1.806.855 1.806 1.944 0 1.09-.795 1.944-1.806 1.944-1.01 0-1.806-.855-1.806-1.944z"/>
                   </svg>
                 </span>
-                <a :href="build.commitUrl" class="short-sha monospace">da57eb39</a>
+                <a :href="build.commitUrl" class="short-sha monospace">{{ build.shortSha }}</a>
               </h5>
               <span>
                 <a :href="build.url" class="build-date">{{ build.date }}</a>