Ensure all examples in the osc.js-examples repository use type metadata

[colinbdclark]

While all the documentation for osc.js uses explicit type metadata, the osc.js-examples repository examples do not consistently do so. This raises the risk, as seen in #185, where example code gets copied from different sources and thus multiple Ports in a single app do not consistently use the same formats, leading to issues like #187.

Until the option gets flipped in an API-breaking way in osc.js 3.0.0, all examples everywhere should use metadata: true.