Negative LineHandleAdornment.ZIndex with AlwaysOnTop crashes

[einsteinK]

A rendered LineHandleAdornment will crash studio under those circumstances:

• ZIndex is below -2
• AlwaysOnTop is set to true
• Adornee is set to a visible part

Not tested with other Adornments or with the camera far from the adornment.

Works both in studio and online.

[Anaminus]

From ROBLOX/Core-Scripts/issues/172:

I am able to reproduce this, but only if the ZIndex is less than -2.

[zeux]

Fixed.