profcollectd: fix setting ACL bits

Unlike C++17 filesystem library, Rust OpenOptions.mode masks the given ACL
bits with environment umask. This behaviour is unintended.

Since the Rust API doesn't not provide a way to set ACL without umask
during file creation, change the permission after the fact.

Test: manual
Bug: 189325542
Change-Id: I285c36d93d69e8304177d54dc48429f924020f8a
1 file changed