Update VE core submodule to master (74a059a)

New changes:
da51da3 ve.ui.MediaSizeWidget: Use lowercase types hint for primitive value
54a8606 Blur the surface when a dialog is opened
3c3234f Don't show phantoms for hidden protected items
0fb119b Fix handleEnter in nodes that don't split
74a059a Don't allow getNearestCorrectOffset to return -1

Change-Id: I7c5669eb780d4b73b056ce1ca5daed453e7398df