remove unnecessary extends in test/.eslintrc
remove unnecessary extends in test/.eslintrc

Due to [ESLint Configuration Cascading and Hierarchy], the configuration
from the parent directory is already included.  Explicitly extending
from it only creates extra work and potential for confusion.

[ESLint Configuration Cascading and Hierarchy]: https://eslint.org/docs/latest/user-guide/configuring/configuration-files#cascading-and-hierarchy

Signed-off-by: Kevin Locke <ffb4761cba839470133bee36aeb139f58d7dbaa9@kevinlocke.name>

kevinoid/promised-read,kevinoid/promised-read,kevinoid/promised-read