Used Signed and unsigned types, should be fixed now

[TommiPrami]

Fixed compiler WARNINGS: W1024 Combining signed and unsigned types - widened both operands

Summary by Bito

• This pull request modifies variable types in the DSiWin32.pas file to ensure compatibility and prevent potential issues related to signed and unsigned types.
• The changes enhance type safety by aligning the data types used in the functions.
• Compiler warnings related to type usage are addressed.
• Overall, this pull request touches on type safety and code quality improvements, introducing potential issues if not properly managed.