Make minor chagnes

Make changes in the output value of Faculty in some splaces of the codes as the type is now Enum.

src/main/java/staffconnect/storage/JsonAdaptedPerson.java

@@ -60,7 +60,7 @@ public JsonAdaptedPerson(Person source) {
         name = source.getName().fullName;
         phone = source.getPhone().value;
         email = source.getEmail().value;
-        faculty = source.getFaculty().value;
+        faculty = source.getFaculty().toString();
         venue = source.getVenue().value;
         module = source.getModule().value;
         tags.addAll(source.getTags().stream()

src/main/java/staffconnect/ui/PersonCard.java

@@ -54,7 +54,7 @@ public PersonCard(Person person, int displayedIndex) {
         id.setText(displayedIndex + ". ");
         name.setText(person.getName().fullName);
         phone.setText(person.getPhone().value);
-        faculty.setText(person.getFaculty().value);
+        faculty.setText(person.getFaculty().toString());
         venue.setText(person.getVenue().value);
         module.setText(person.getModule().value);
         email.setText(person.getEmail().value);

src/test/java/staffconnect/testutil/PersonUtil.java

@@ -35,7 +35,7 @@ public static String getPersonDetails(Person person) {
         sb.append(PREFIX_NAME + person.getName().fullName + " ");
         sb.append(PREFIX_PHONE + person.getPhone().value + " ");
         sb.append(PREFIX_EMAIL + person.getEmail().value + " ");
-        sb.append(PREFIX_FACULTY + person.getFaculty().value + " ");
+        sb.append(PREFIX_FACULTY + person.getFaculty().toString() + " ");
         sb.append(PREFIX_VENUE + person.getVenue().value + " ");
         sb.append(PREFIX_MODULE + person.getModule().value + " ");
         person.getTags().stream().forEach(