fixed malformed key down event (#1084)
fixed malformed key down event (#1084)

Google Chrome auto-filling of login forms could raise a malformed event
sereepap2029/playcanvas,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,MicroWorldwide/PlayCanvas,sereepap2029/playcanvas,playcanvas/engine,sereepap2029/playcanvas,playcanvas/engine,aidinabedi/playcanvas-engine,guycalledfrank/engine,guycalledfrank/engine