Create account modal: don't open Facebook popup when pressing Enter in an input field, fixes #3729
Create account modal: don't open Facebook popup when pressing Enter in an input field, fixes #3729

Ref: #3729

`<button>`s are `type="submit"` by default.

javatlacati/codecombat,VilkkuV/codecombat,codecombat/codecombat,probil/codecombat,javatlacati/codecombat,codecombat/codecombat,Zerrien/codecombat,fabichoi/codecombat,edtrist/codecombat,edtrist/codecombat,jeremyprice/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,jeremyprice/codecombat,jeremyprice/codecombat,codecombat/codecombat,probil/codecombat,kidaa/codecombat,probil/codecombat,jeremiahyan/codecombat,kidaa/codecombat,javatlacati/codecombat,Zerrien/codecombat,kidaa/codecombat,javatlacati/codecombat,fabichoi/codecombat,edtrist/codecombat,icodegame/codecombat,fabichoi/codecombat,icodegame/codecombat,icodegame/codecombat,Zerrien/codecombat,codecombat/codecombat,codecombat/codecombat,jeremiahyan/codecombat,VilkkuV/codecombat,Zerrien/codecombat,probil/codecombat,kidaa/codecombat,icodegame/codecombat,fabichoi/codecombat,jeremyprice/codecombat,VilkkuV/codecombat,jeremiahyan/codecombat,edtrist/codecombat,VilkkuV/codecombat