The ProxySQL startup script was incorrectly using
the `--reload` flag, which only reloads/merges the configuration
without initializing the database from the config file [1]. This
change corrects it to use the `--initial` flag, ensuring that
the database is always reloaded from the configuration at startup.

[1] https://proxysql.com/documentation/configuring-proxysql/#initialstartup

Change-Id: I9cc721555a6d19409b6ac24432b6b34a83efc42c