Adds check for local variable in scope operator check

[Ruzihm]

Adds check for local variable in scope operator check.

Example code from goon:

proc/generate_copyrighted_colors()
	src.copyrighted_colors = list()
	for (var/obj/item/clothing/head/type as anything in src.copyrighted_berets)
		var/icon/icon = icon(type::icon, type::icon_state) // <-- type now interpreted as a local var
		copyrighted_colors[global.get_average_color(icon)] = rand(10000, 999999)

[amylizzle]

lgtm, but add a unit test