Use refactored buildDetails hook in build tasks UI.

frontend/components/site/siteBuildTasks.jsx

@@ -7,6 +7,7 @@ import prettyBytes from 'pretty-bytes';
 import {
   IconCheckCircle, IconClock, IconExclamationCircle, IconSpinner,
 } from '../icons';
+import { useBuildDetails } from '../../hooks';
 import CommitSummary from './CommitSummary';
 import api from '../../util/federalistApi';
 
@@ -55,19 +56,10 @@ const SiteBuildTasks = () => {
   const buildId = parseInt(buildIdStr, 10);
   const [buildTasks, setBuildTasks] = useState([]);
 
-  const [build, setBuild] = useState({
-    buildDetails: null,
-  });
-  const { buildDetails } = build;
+  const { buildDetails } = useBuildDetails(buildId);
 
   let intervalHandle;
   useEffect(() => {
-    if (!buildDetails) {
-      api.fetchBuild(buildId).then(data => setBuild({
-        buildDetails: data,
-      }));
-    }
-
     function fetchTasks(thisBuildId) {
       return api.fetchTasks(thisBuildId).then((tasks) => {
         setBuildTasks([...tasks]);