Fix submodule update error

[mouseos]

The following error occurs with the current .gitmodules. Fixed so that the error does not occur.

PS D:\work\project\unity\OSS\UnityAbletonLink> git submodule update --init --recursive
Cloning into 'D:/work/project/unity/OSS/UnityAbletonLink/abl_link'...
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of '[email protected]:libpd/abl_link.git' into submodule path 'D:/work/project/unity/OSS/UnityAbletonLink/abl_link' failed
Failed to clone 'abl_link'. Retry scheduled
Cloning into 'D:/work/project/unity/OSS/UnityAbletonLink/abl_link'...
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of '[email protected]:libpd/abl_link.git' into submodule path 'D:/work/project/unity/OSS/UnityAbletonLink/abl_link' failed
Failed to clone 'abl_link' a second time, aborting