fix(virtual-list): virtualTrackBy reference
fix(virtual-list): virtualTrackBy reference

TillaTheHun0/ionic,alan-agius4/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,driftyco/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic,driftyco/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic