Add CHARACTERSET to display_name

src/main/resources/sql/createtables.sql

@@ -194,7 +194,7 @@ CREATE TABLE Timeslot (
 -- Table: User
 CREATE TABLE User (
     netid varchar(100) CHARACTER SET utf8mb4 NOT NULL,
-    display_name varchar(512) NOT NULL,
+    display_name varchar(512) CHARACTER SET utf8mb4 NOT NULL,
     first_name varchar(255) CHARACTER SET utf8mb4 NOT NULL,
     last_name varchar(255) CHARACTER SET utf8mb4 NOT NULL,
     email varchar(255) CHARACTER SET utf8mb4 NOT NULL,