fix: remove unneeded print statement

[willemneal]

fixes #1539

Also fixes the the json returned is not valid and would have to be edited by the consumer to convert to a JSON list of events.

[leighmcculloch]

@willemneal There's an e2e test failure.

[willemneal]

@leighmcculloch @chadoh I fixed the e2e test here, but I forget how to update it here since it's not on the stellar repo: stellar/system-test#103

[leighmcculloch]

I forget how to update it here

There's nothing to update in this repo, just rerun the test after the fix is merged. This repo uses the master branch of the system-test repo.

I've merged stellar/system-test#103 and rerun the failed build:

• https://github.com/stellar/stellar-cli/actions/runs/10612677809/job/29418324099?pr=1554

[willemneal]

@leighmcculloch Just realized that the e2e tests didn't even expect valid json. Fixed that in this PR and here:

e2e tests now use correct variable stellar/system-test#104