state/tracker_test: remove undefined init

$ go test github.com/fluffle/goirc/state
# github.com/fluffle/goirc/state
src/github.com/fluffle/goirc/state/tracker_test.go:10: undefined: logging.InitFromFlags
src/github.com/fluffle/goirc/state/tracker_test.go:11: undefined: logging.SetLogLevel
src/github.com/fluffle/goirc/state/tracker_test.go:11: undefined: logging.LogFatal
FAIL    github.com/fluffle/goirc/state [build failed]

The two logging calls https://github.com/fluffle/goirc/blob/master/state/tracker_test.go#L10
```
	logging.InitFromFlags()
	logging.SetLogLevel(logging.LogFatal)
```
are undefined in referenced goirc/logging package https://github.com/fluffle/goirc/blob/master/logging/logging.go
Removing so test works.