Set our template as default for WebGL

[juans-chainsafe]

In WebGL the default template is "Default" we should put "Web3.Unity" as the default template, otherwise this error appears:

Invoking error handler due to
ReferenceError: web3UnityInstance is not defined
at _Connect (http://localhost:51205/Build/webgldev.framework.js.gz:30:25044)
webgldev.framework.js.gz:30 Uncaught (in promise) ReferenceError: web3UnityInstance is not defined
    at _Connect (webgldev.framework.js.gz:30:25044)

Expected: