fix: 🐛 Fix race condition when loading derived display sets (#1718)

When we have multiple SEGs/RTSTRUCTs we intend to load the most recent
by default.

BREAKING CHANGE: 🧨 However we start to load once the first set of metadata arrives. We need
to wait until all series metadata is fetched.

✅ Closes: #1715

Co-authored-by: James Petts <jamesapetts@gmail.com>

platform/viewer/src/connectedComponents/ViewerMain.js

@@ -150,6 +150,7 @@ class ViewerMain extends Component {
       <div className="ViewerMain">
         {this.state.displaySets.length && (
           <ConnectedViewportGrid
+            isStudyLoaded={this.props.isStudyLoaded}
             studies={this.props.studies}
             viewportData={viewportData}
             setViewportData={this.setViewportData}