games/anki: Update to 2.1.49

While I'm here:

• Use ECHO_CMD instead of ECHO as the latter one is already defined in /usr/share/mk/sys.mk, which can either be "echo" or "true" if the make flag -s is given.

Changelog:

https://github.com/ankitects/anki/releases/tag/2.1.49

PR: 262735
Reported by: Pau Amma
MFH: No (2022Q2 is soon)