fix(wolfcrypt-wrapper): fix ctx_len type in dilithium verify ctx functions

wc_dilithium_verify_ctx_msg and wc_dilithium_verify_ctx_hash take
ctxLen as u8 (matching the 255-byte limit enforced above), but the
variables were cast to u32. Fix both to use u8, consistent with all
other ctx_len usages in this file.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: MarkAtwood

wolfcrypt-wrapper/src/dilithium.rs

@@ -1236,7 +1236,7 @@ impl Dilithium {
             return Err(sys::wolfCrypt_ErrorCodes_BUFFER_E);
         }
         let sig_len = sig.len() as u32;
-        let ctx_len = ctx.len() as u32;
+        let ctx_len = ctx.len() as u8;
         let msg_len = msg.len() as u32;
         let mut res = 0i32;
         let rc = unsafe {
@@ -1282,7 +1282,7 @@ impl Dilithium {
             return Err(sys::wolfCrypt_ErrorCodes_BUFFER_E);
         }
         let sig_len = sig.len() as u32;
-        let ctx_len = ctx.len() as u32;
+        let ctx_len = ctx.len() as u8;
         let hash_len = hash.len() as u32;
         let mut res = 0i32;
         let rc = unsafe {