games/anki: Update to 2.1.46
- Remove DIST_SUBDIR, which once made sense when Anki was still a pure Python port. Anki now needs a lot of Rust crates that are also used by other ports.
Therefore, these crates should be placed in the usual place and not in an additional subdirectory to save bandwidth and disk space. [1]
Reported by: se [1]
MFH: 2021Q3
(cherry picked from commit 83f30a2775ac114cf71dab7ea64917c618668f42)