[6.0] Fix NSDecimal interpreter test (swiftlang#76893)

We fixed the behavior of Decimal.ulp with swiftlang/swift-foundation#741. We should remove this test with wrong expectations since we already test it in SwiftFoundation

resolves: rdar://137332735

Author: iCharlesHu

test/Interpreter/SDK/NSDecimal.swift

@@ -121,6 +121,5 @@ print(twenty) // CHECK: 2
 twenty = NSDecimalNumber(mantissa: 2, exponent: 1, isNegative: false) as Decimal
 print(twenty.significand) // CHECK: 2
 print(twenty.exponent) // CHECK: 1
-print(twenty.ulp) // CHECK: 10
 
 print(Decimal(sign: .plus, exponent: -2, significand: 100)) // CHECK: 1