[BUG] overmind-statechart@next: specifying onInitializeOvermind overrides internal initialization

When the config contains an onInitializeOvermind action, the internal initialization method is overriden. This will cause the charts not being sent to the devtools anymore (and probably breaks other stuff).

The problem originates here:

overmind/packages/node_modules/overmind-statechart/src/index.ts

Lines 331 to 333 in 574e486

    
           if (key === 'onInitializeOvermind') { 
        
             aggr[key] = actions[key] 
        
           } else {

This will override this action:

overmind/packages/node_modules/overmind-statechart/src/index.ts

Line 512 in 574e486

onInitializeOvermind: ((context, instance) => {

	if (key === 'onInitializeOvermind') {
	aggr[key] = actions[key]
	} else {