Make sure courses are updated after switching

src/screens/AssignmentsScreen.tsx

@@ -129,9 +129,7 @@ const AssignmentsScreen: INavigationScreen<IAssignmentsScreenProps> = props => {
   const [searchResult, setSearchResult] = useState(assignments);
 
   useEffect(() => {
-    if (assignments.length) {
-      setSearchResult(assignments);
-    }
+    setSearchResult(assignments);
   }, [assignments.length]);
 
   useEffect(() => {

src/screens/FilesScreen.tsx

@@ -131,9 +131,7 @@ const FilesScreen: INavigationScreen<IFilesScreenProps> = props => {
   const [searchResult, setSearchResult] = useState(files);
 
   useEffect(() => {
-    if (files.length) {
-      setSearchResult(files);
-    }
+    setSearchResult(files);
   }, [files.length]);
 
   useEffect(() => {

src/screens/NoticesScreen.tsx

@@ -121,9 +121,7 @@ const NoticesScreen: INavigationScreen<INoticesScreenProps> = props => {
   const [searchResult, setSearchResult] = useState(notices);
 
   useEffect(() => {
-    if (notices.length) {
-      setSearchResult(notices);
-    }
+    setSearchResult(notices);
   }, [notices.length]);
 
   useEffect(() => {

src/screens/SemestersSettingsScreen.tsx

@@ -32,7 +32,7 @@ const SemestersSettingsScreen: INavigationScreen<
     return () => {
       store.dispatch(getCoursesForSemester(currentSemester as string));
     };
-  }, []);
+  }, [currentSemester]);
 
   const renderListItem: ListRenderItem<ISemester> = ({ item }) => {
     return (
@@ -41,7 +41,9 @@ const SemestersSettingsScreen: INavigationScreen<
         text={item as string}
         icon={currentSemester === item ? <Icon name="check" size={20} /> : null}
         // tslint:disable-next-line: jsx-no-lambda
-        onPress={() => setCurrentSemester(item)}
+        onPress={() => {
+          setCurrentSemester(item);
+        }}
       />
     );
   };