Fix WiFi ELM initialization deadlock

[Vape2Die]

Summary
Fixes a startup deadlock with some WiFi ELM327 adapters that remain silent until receiving a carriage return.

Problem
DDT4ALL waits for the initial '>' prompt before sending ATZ. Some WiFi ELM adapters do not emit this prompt until they receive '\r', causing initialization to hang indefinitely when the socket is blocking.

Fix

• Send '\r' before the initial prompt wait for WiFi adapters
• Ensure expect() does not block indefinitely on WiFi sockets by using a bounded readiness check

Result
WiFi ELM adapters that previously required manual wake-up (e.g. pressing Enter via netcat) now initialize correctly in DDT4ALL.

Reproduction (before fix)

1. Connect to WiFi ELM327
2. Start DDT4ALL
3. Click "Connected mode"
4. Initialization hangs until external input is sent to the adapter

After fix
Initialization completes without external interaction.

Tested

• WiFi ELM327 (192.168.0.10:35000)
• Verified ATZ / ATI responses
• Confirmed DDT4ALL connects without manual intervention