Fix jest test.ts Reference Error and create ./out directory for wasm file in package.json

[marvinmednick]

trafficstars

Corrected a Runtime Error (ReferenceError) encountered when running yarn test per example (from https://docs.near.org/docs/tutorials/contracts/cross-contract-calls) Issue appear to be a stray line left in the file to variable that isn't defined or used elsewhere.

Also adjusted package.json to add a postbuild step to crate the default directory that near deploy expects (./out) copy the contract.wasm into it as main.asm (default name) {similar to what I've seen in other examples}

[marvinmednick]

Reopening after cleaning my comments/description

[marvinmednick]

Fixes issue Yarn jest fails to run with a Reference Error #201