test:build broken since latest mpl-token-metadata change

[basvanberckel]

Describe the bug The build.ts script for the test:build npm script is broken since https://github.com/metaplex-foundation/metaplex-program-library/commit/df7a8d5bc644869e1292f18c76287194c1227f61

The mpl-token-metadata.so binary is now placed in another directory, meaning amman cannot find the program file anymore.

To Reproduce Steps to reproduce the behavior:

1. run npm test:build
2. run npm test:init
3. The validator will not come online, due to the token-metadata.so file not being in the expected location.

Expected behavior All compiled bpf programs should be output to a directory that amman can locate