pebble: console.log no longer logs to pebble's console, even in release builds

[jplexer]

Build environment: macOS (but doesnt matter)
Moddable SDK version: Pebble fork based on 8.2.3 (git describe:
8.2.3-4-g25f1a3bb1), as vendored in PebbleOS third_party/moddable/moddable
Target device: Pebble watch (ARMv8-M, MPU-enforced privilege separation).
Reproduces both on real hardware and on the Pebble QEMU emulator

Description
According to some reports, after the update adding xsbug support to Pebble, console.log calls no longer output to the Pebble APP_LOG, even when building in Release/non-Debug builds

Steps to Reproduce

1. Build and install an app that has console.log using pebble build and pebble install --logs (note that this isnt a debug build that will start xsbug)
2. See (no) logs

Expected behavior
Logs will still write to Pebble's APP_LOG, especially when not built using --debug

Other information
We've had a few reports of this:
https://www.reddit.com/r/pebble/comments/1ui04hk/i_am_going_insane_re_cloudpebble_javascript_sdk/

[phoddie]

This got broken with the xsbug integration. Apologies. If you run with xsbug (which you should when developing!), traces, including console.log() go there.

I've updated the implementation so traces go to xsbug when connected, and otherwise output via APP_LOG as before.