Fix copy-paste errors in test naming

frontend/src/store/modules/__tests__/availability.js

@@ -36,7 +36,7 @@ const limits =
   },
 ];
 
-describe('The availability store store', () => {
+describe('The availability store', () => {
   it('Should be initialized with the correct values', () => {
     expect(store.state.availableTimeslots).toEqual([]);
     expect(store.state.preferredTimeslots).toEqual([]);
@@ -66,7 +66,7 @@ describe('Availability mutations', () => {
   });
 });
 
-describe('Courses actions', () => {
+describe('Availability actions', () => {
   const actions = store.actions;
 
   let context;