Update w2form.js
Update w2form.js

fix w2form.getChanges() not working
aadrian/w2ui,aadrian/w2ui,aadrian/w2ui,vitmalina/w2ui,aadrian/w2ui,vitmalina/w2ui,aadrian/w2ui,vitmalina/w2ui,vitmalina/w2ui,vitmalina/w2ui,vitmalina/w2ui,aadrian/w2ui,vitmalina/w2ui,aadrian/w2ui