SeaBee does not block file modification with sed

[awandke]

This appears to only be a problem for file protected under a SeaBee policy, not seabee itself.

Reproduce with the following sample policy:

name: sample-policy
version: 1
scope:
files:
  - /home/test_file
config:
  file_write_access: block

and the command sudo sed -i 's/^/Test!/' /home/test_file

No SeaBee logs will be printed and the file is modified.

The underlying cause is currently unclear