fix(opentracing-shim): update opentracing shim example #990
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Which problem is this PR solving?
A previous update to the opentracing-shim example had modified to this to incorrectly use a setter method to set the global tracer. A similar method exists on the OpenTelemetry API but not the OpenTracing API. This was causing JavaScript errors when attempting to run the example.
Short description of the changes
Update to call the correct method on the OpenTracing API to initialise the global tracer.
Fixes #988