ace2_inner: Fix argument bug in `execCommand()`
ace2_inner: Fix argument bug in `execCommand()`

This fixes a bug introduced in commit
c38c34bef47a74467394797b34165641a87ac620.

storytouch/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite