Fixed JWT Role assignment and method access

src/main/java/com/faf223/expensetrackerfaf/model/Credential.java

@@ -29,7 +29,7 @@
             this.email = email;
             this.password = password;
 
-            this.role = Role.USER;
+            this.role = Role.ROLE_USER;
         }
     }
 

src/main/java/com/faf223/expensetrackerfaf/model/Role.java

@@ -2,5 +2,5 @@
 package com.faf223.expensetrackerfaf.model;
 
 public enum Role {
-    USER, ADMIN
+    ROLE_USER, ROLE_ADMIN
 }