58 Undefined api key message is cropped in latest plugin
58 Undefined api key message is cropped in latest plugin

Changelog:
- revert invalid API key error code to 300 to match what index.js
  expects
- remove stale comment

Tests:
- Verifed that the invalid API key message is now displayed correctly

Macadamian/Cordova-BlinkUpPlugin,Macadamian/Cordova-BlinkUpPlugin