OpcodeDispatcher: fix folding negative offsets for 32-bit

I don't know what I was thinking when I wrote that code. Drop the silly logic
and let ConstProp inline the immediates. This fixes a lot of silly code
generated for 32-bit.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp

@@ -4311,7 +4311,7 @@ AddressMode OpDispatchBuilder::SelectAddressMode(AddressMode A, bool AtomicTSO,
         return {
           .Base = A.Base,
           .Index = _Constant(A.Offset),
-          .IndexType = (Const_16K && A.Offset < 0) ? MEM_OFFSET_SXTW : MEM_OFFSET_SXTX,
+          .IndexType = MEM_OFFSET_SXTX,
           .IndexScale = 1,
         };
       }