pac4j: don't wrap exception as runtime exception

[jknack]

Stacktrace:

  at jars//org.pac4j.core.engine.AbstractExceptionAwareLogic.runtimeException(AbstractExceptionAwareLogic.java:71)
        at jars//org.pac4j.core.engine.AbstractExceptionAwareLogic.handleException(AbstractExceptionAwareLogic.java:56)
        at jars//org.pac4j.core.engine.DefaultSecurityLogic.perform(DefaultSecurityLogic.java:174)
        at jars//io.jooby.internal.pac4j.SecurityFilterImpl.perform(SecurityFilterImpl.java:83)

Let's throw the real exception