Fix NodeJS check for electron renderer

[greymoth-jp]

The same NODE_JS detection issue was fixed in js-sha256 (emn178/js-sha256#49) but not here. The check returns true in an Electron renderer started with nodeIntegrationInWorker: true, because process exists in that context. Electron sets process.type to "renderer" there, so this adds the matching process.type != 'renderer' guard. With it the renderer takes the pure-JS path instead of trying to wrap Node's crypto.

The change is the same one-line guard already merged in js-sha256. mocha tests/node-test.js still passes (8360 tests): under normal Node process.type is undefined, so NODE_JS stays true and behavior there is unchanged.