Token Swap related fixes

[Xor-el]

⚠️ NOTE: This PR has the following fixes a couple of token swap related issues

Status	Type	⚠️ Core Change	Issue
Ready	BugFix	No	None

Problem

1. When executing the TokenSwap example, the following error occurs: invalid account data for instruction

2. The Token Swap Curve Type is decoded incorrectly in DecodeInitializeData due to the use of an incorrect byte offset.

Solution

1. Updated the instruction builder to use the correct token swap account data length when constructing instructions.

2. Fixed the DecodeInitializeData method to use the proper byte offset when decoding the Curve Type field.