lib: remove unused decodeLatin1 import

Remove the decodeLatin1 import from encoding_binding as it is no longer
used after disabling the Latin-1 fast path for Windows-1252.

Author: yashwantbezawada

lib/internal/encoding.js

@@ -54,7 +54,6 @@ const {
   encodeIntoResults,
   encodeUtf8String,
   decodeUTF8,
-  decodeLatin1,
 } = binding;
 
 const { Buffer } = require('buffer');