Fix linter errors

client/views/Exam.jsx

@@ -104,14 +104,14 @@ class Exams extends React.Component {
 
   updateFeedback = (feedback) => {
     var widgets = this.state.widgets
-    const idx = widgets[this.state.selectedWidgetId].problem.feedback.findIndex(e => { return e.id == feedback.id })
-    if(idx == -1) widgets[this.state.selectedWidgetId].problem.feedback.push(feedback)
+    const idx = widgets[this.state.selectedWidgetId].problem.feedback.findIndex(e => { return e.id === feedback.id })
+    if (idx === -1) widgets[this.state.selectedWidgetId].problem.feedback.push(feedback)
     else {
-      if(feedback.deleted) widgets[this.state.selectedWidgetId].problem.feedback.splice(idx, 1)
+      if (feedback.deleted) widgets[this.state.selectedWidgetId].problem.feedback.splice(idx, 1)
       else widgets[this.state.selectedWidgetId].problem.feedback[idx] = feedback
     }
     this.setState({
-      widgets:widgets
+      widgets: widgets
     })
   }
 

client/views/grade/EditPanel.jsx

@@ -40,8 +40,8 @@ class EditPanel extends React.Component {
   }
 
   static getDerivedStateFromProps (nextProps, prevState) {
-      // In case nothing is set, use an empty function that no-ops
-    const updateCallback = nextProps.updateCallback || ( _ => {})
+    // In case nothing is set, use an empty function that no-ops
+    const updateCallback = nextProps.updateCallback || (_ => {})
     if (nextProps.feedback && prevState.id !== nextProps.feedback.id) {
       const fb = nextProps.feedback
       return {
@@ -94,7 +94,7 @@ class EditPanel extends React.Component {
     } else {
       api.post(uri, fb)
         .then((response) => {
-            // Response is the feedback option
+          // Response is the feedback option
           this.state.updateCallback(response)
           this.setState({
             id: null,