Fixed issue: --buildId will disnable --no-signing

Fixed issue:
1. `webworks build --release --buildId 1234 --no-signing`: `--no-signing` will be ignored when a `--buildId` is provided
2. `webworks build [--debug] --buildId 1234`: `--buildId` won't effect, which should be set in manifest of bar file.
Why not leave the copyArgIfExists function alone? It sets up the commands exactly as they need to be set and avoids errors like this... The way this is coded the packager would puke if passed params or loglevel.