Fix the tracking plan when load options are specified

[Rowno]

The tracking plan All: false is being stripped when All: false is passed in the load options, which makes the tracking plan mostly inert.

[f2prateek]

So the bug here was when analytics.js would be initialized like this (as the consent manager would do):

analytics.load("mA3XTMcavCUOQo5DL56VIHWcJMsyhAI7", {
  integrations: {
    All: false,
    'Segment.io': true,
    Amplitude: true,
  }
});

And when the plan had disabled an event, say "Completed Order". Here planIntegrations = { All: false, 'Segment.io', true }.

In this case, when this LOC (before this change) is executed:

  if (planIntegrations.All === false) {
    integrations = {};
  }

This would cause the All: false to be removed in the final integrations object, and would have sent the event to all integrations that didn't explicitly have a value set.

[f2prateek]

nice catch, LGTM!