Correct the typo for the dev composer package name

[sc0ttkclark]

🎫 Ticket

[TBD]

🗒️ Description

This addresses a problem with composer.json where the incorrect package is being referenced (package doesn't exist). This was a typo from a while back, fixing it resolves the problem where the package code isn't available.

[sc0ttkclark]

Realizing now that the repo itself has the wrong package name too: https://github.com/lucatume/wp-snapshot-assertions/blob/master/composer.json#L2

cc @lucatume what do you think we should do here?