fixed bugs in payroll and edit employee

...ain/java/com/example/scheduler_server/ScheduleServer.java

...pp/src/main/java/com/example/schedulerapp/Controller.java

...ulerApp/src/main/java/com/example/schedulerapp/Model.java

...p/src/main/java/com/example/schedulerapp/ScheduleApp.java

...main/resources/com/example/schedulerapp/editEmployee.fxml

...urces/com/example/schedulerapp/staffManagerSidePanel.fxml