Strip excess newlines from formatting test

The result's basically the same either way, only difference is
things like

 "emptyObject": {

 },

Are now

 "emptyObject": {
 },

Results are still pretty, now passes in both Zend and HHVM

Change-Id: I6afa0fd49a7aef3f6b7ca1b4574f3de555521348
Merge "Strip excess newlines from formatting test"