Make account changeonlinestatus online flag optional

[egieseke]

Summary

Since the online option in the goal account changeonlinestatus defaults to true, updated the command so that the online option is not required.

Test Plan

Ran make test and make integration.

[tsachiherman]

The change itself is fine, but it's missing the corresponding unit test.
The unit test should be one that fails without the goal change and passes with.
( i.e. the unit test should cover the correct behavior of goal utility in regards to this command )

[egieseke]

@tsachiherman There is an integration test for this today, which uncovered the issue as part of the Jenkins/Mule integration work. The test is: test/e2e-go/cli/goal/expect/listExpiredParticipationKeyTest.exp

[tsachiherman]

@tsachiherman There is an integration test for this today, which uncovered the issue as part of the Jenkins/Mule integration work. The test is: test/e2e-go/cli/goal/expect/listExpiredParticipationKeyTest.exp

Yes, but this integration test is clearly broken. Otherwise, it would have failed before.
( i.e. it should have consistently failed without the changes you've made here. this clearly did not happen )

For this PR to be complete, it should demonstrate the not passing the "online" flag at all is equivalent to passing a "online true", as well as that the "online false" is working as expected.

I'm dismissing my change requests since my upcoming change would include a fix for this issue.