Change datatype to be packed at delete_user.

[core-burner]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. initialize data: None
2. execute command: delete_user(uid...)
3. See error "Value passed must be -32768 to 32767

Expected behavior A clear and concise description of what you expected to happen. delete_user should be able to handle I integer up to 4,294,967,295 as it is on enroll_user

Capture Data Try to always include captured data (pcap files from wireshark (tutorial), and verbose output from test_machine if applicable)

System (please complete the following information):

• OS: [e.g. iOS, Debian 9]
• Python version [e.g. 2.7, 3.5]]

Additional context Add any other context about the problem here. This would fix the delete_user function and should be compatible across all reader models.