Inserter ghosts should display current max stack size instead of defaulting to 1

[Arcus]

Currently inserter ghosts will always show a value of stack size = 1 if you attempt to interact with the ghost. Once built they are set to the max stack size based on research, but this might potentially cause some confusion if players are tweaking the ghost entity's settings.

I feel like it would be better it showed the actual value in preview instead of only updating once built.