Fix wrong command line usage help

[Marcono1234]

-cp takes paths separated by the 'path separator' (':' or ';'), but File.separatorChar is '/' respectively '\'.

For example, for me on Windows running java -jar ./jazzer_standalone.jar --help currently erroneously shows:

Usage:

  java -cp jazzer.jar[\classpath_entries] com.code_intelligence.jazzer.Jazzer --target_class=<target class> [args...]

  java -cp jazzer.jar[\classpath_entries] com.code_intelligence.jazzer.Jazzer --autofuzz=<method reference> [args...]

(note the -cp jazzer.jar[\classpath_entries])

[Marcono1234]

CI is failing with:

The job was not started because your account is locked due to a billing issue.

I assume "you" refers to CodeIntelligenceTesting here, not me?