fix(test): adjust chunk size calculation for APDU length limits

- Subtract data length from MAX_APDU_LEN when splitting messages
- Fix chunk size calculation in deployModule and initContract
- Update split_message calls to account for header bytes
- Ensure first chunk (len + data) stays within MAX_APDU_LEN limit

Fixes APDU length overflow where first chunk (2 bytes length + data)
exceeded MAX_APDU_LEN by not accounting for the length bytes in the
available space calculation.

tests/application_client/boilerplate_command_sender.py

@@ -825,7 +825,7 @@ def init_contract(
             raise ExceptionRAPDU(temp_response.status)
         # Send the name
         data = len(name).to_bytes(2, byteorder="big")
-        name_chunks = split_message(name, MAX_APDU_LEN)
+        name_chunks = split_message(name, MAX_APDU_LEN - len(data))
         for i, chunk in enumerate(name_chunks):
             if i == 0:
                 data += chunk
@@ -842,7 +842,7 @@ def init_contract(
                 raise ExceptionRAPDU(temp_response.status)
         # Send the params
         data = len(params).to_bytes(2, byteorder="big")
-        params_chunks = split_message(params, MAX_APDU_LEN)
+        params_chunks = split_message(params, MAX_APDU_LEN - len(data))
         last_chunk = params_chunks.pop()
         for i, chunk in enumerate(params_chunks):
             if i == 0: