ExprReversedList Fix

[Absolutionism]

Problem

When using a combination of ExprReversedList, a literal, and another expression that intakes the literal type, was causing incorrect parsing. Such as reversed 5 times
Since there were no checks if the expression being used in ExprReversedList was single, 5 was acceptable, and ExprReversedList#getReturnType uses the return type from the expression, in this case 5, it was then resulting in times being done afterwards
Parse result: (reversed 5) times

Solution

Simply checks if the expression is single in ExprReversedList and returns false if so.

Testing Completed

8170-reversed-single.sk

Supporting Information

N/A

---

Completes: #8170
Related: none