[SDL2 Windows] Fix black icon in Task Bar
[SDL2 Windows] Fix black icon in Task Bar

Sometimes I got a black icon in the task bar. 
This code updates the icon correctly, without having to implement Lib.setIcon() 
Tested on Windows 10.
madrazo/nme,haxenme/nme,madrazo/nme,haxenme/nme,thomasuster/NME,thomasuster/NME,madrazo/nme,haxenme/nme,thomasuster/NME,madrazo/nme,thomasuster/NME,madrazo/nme,haxenme/nme,madrazo/nme,haxenme/nme,thomasuster/NME,thomasuster/NME