Fix remote view indicators by correctly reading the item prototype from cursor ghost

[CodeW0lf]

Cursor Stack Handling Improvements

Refactored the cursor stack handling logic in control.lua to properly handle both ghost items and real items:

• Fixed a bug where ghost items weren't being handled correctly
• cursor_ghost is an ItemIDAndQualityIDPair table which is different from a stack and will never be valid_for_read
• Grabbing prototypes directly from the cursor_ghost or cursor_stack