Pack specific stickers now show on user page

src/main/java/team5/smartTowns/rewards/Reward.java

...main/java/team5/smartTowns/rewards/RewardsRepository.java

.../java/team5/smartTowns/rewards/RewardsRepositoryJDBC.java

src/main/java/team5/smartTowns/rewards/Sticker.java

src/main/java/team5/smartTowns/users/UserController.java

src/main/resources/data.sql

src/main/resources/schema.sql

src/main/resources/static/scripts/login.js