Fix Max XP displaying Max Grade (#372)

* Fix Max XP displaying Max Grade

* Update test

Author: remo5000

src/components/assessment/__tests__/__snapshots__/index.tsx.snap

@@ -116,7 +116,7 @@ exports[`Assessment page does not show attempt Button for upcoming assessments f
                                 <div className=\\"row listing-xp\\">
                                   <h6>
                                      
-                                    Max XP: 3000
+                                    Max XP: 1000
                                      
                                   </h6>
                                 </div>
@@ -606,7 +606,7 @@ exports[`Assessment page with multiple loaded missions renders correctly 1`] = `
                                 <div className=\\"row listing-xp\\">
                                   <h6>
                                      
-                                    Max XP: 3000
+                                    Max XP: 1000
                                      
                                   </h6>
                                 </div>

src/components/assessment/index.tsx

@@ -302,7 +302,7 @@ const makeOverviewCard = (
             {' '}
             {beforeNow(overview.openAt)
               ? `XP: ${overview.xp} / ${overview.maxXp}`
-              : `Max XP: ${overview.maxGrade}`}{' '}
+              : `Max XP: ${overview.maxXp}`}{' '}
           </h6>
         </div>
         <div className="row listing-description">