'/balance' command shouldn't be executed by console

[MCUmbrella]

Describe the bug
The plugin is missing necessary sender type check when performing player-only commands. When the /bal command is executed by the console the plugin will throw ClassCastException

To Reproduce
Steps to reproduce the behavior:

1. Type /bal in the console
2. See error

Expected behavior
The plugin denied to perform the command and print an error message (e.g. "This command is player-only")

Screenshots
Not needed

Server Info (please complete the following information):
—OS: Linux
— Java: openjdk version "11.0.13" 2021-10-19 LTS
—Version 0.0.10

CCLogs
Not needed

Server logs
https://www.toptal.com/developers/hastebin/ivocusopot.properties

Additional context
None

[NinekoTheCat]

Thank you for writing about this bug, I will get to fixing it right away.