[ticket/12709] Update plupload.full.min.js

The earlier js file was not returning the correct list of filesAdded

PHPBB3-12709
Merge remote-tracking branch 'dhruvgoel92/ticket/12709' into develop-ascraeus

* dhruvgoel92/ticket/12709:
  [ticket/12709] Update plupload.full.min.js
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12709] Update plupload.full.min.js