--key does not work with videowmark

[DashLt]

Hello!

Thank you for this excellent program. I've encountered an issue when trying to add a watermark with a key.

The command & output:

videowmark add --key filename.key /source/path /dest/path message
Audio Codec:  -c:a aac -ab 193247
audiowmark: unsupported global option '--key' (use audiowmark -h)
videowmark: error: watermark generation failed (audiowmark)

Looking at the videowmark code, it seems that the key is being added to the global args:
--key ) AUDIOWMARK_ARGS+=("--key" "$2"); shift 2 ;;

A possible solution would be to add a separate variable for after-command args. I will try to do this later and open a PR, though my bash is not very good...

[swesterfeld]

Thanks, should be fixed by eced66f.