fix(files): Correctly copy the cache information on copy operations

[artonge]

Needed to copy the encrypted flag of encrypted files when those files are two level down in a moved folder.

Reproduction steps of the issue:

• Set up the following folder structure
  • /A/B/t.txt
  • /C
• Copy A in C
• t.txt is encrypted but does not have the encrypted flag set to true, and therefore not readable.

With this PR, t.txt is readable.

Note: Open to better ways to share code between the two methods.