Quotas: remove deprecated configuration variable

Commit e17f6fd56d079c55921f2030275d8f5719748763 deprecated
the variable quota_injected_file_path_bytes in Juno. This
has been removed.

Change-Id: I61912a73b8a464d2fafed6c2463daaaecc0da1c0
Merge "Quotas: remove deprecated configuration variable"