Remove duplicate scale building

[kurkle]

Remove duplicate calls to ensureScalesHaveIDs and buildOrUpdateScales from initialize.

These two are also called from updateConfig:

Chart.js/src/core/core.controller.js

Lines 132 to 133 in 6b3e43d

	chart.ensureScalesHaveIDs();
	chart.buildOrUpdateScales();

Which is called from update:

Chart.js/src/core/core.controller.js

Line 452 in 6b3e43d

updateConfig(me);

Which in turn is called from construct (right after initialize):

Chart.js/src/core/core.controller.js

Lines 206 to 207 in 6b3e43d

	me.initialize();
	me.update();

Edit: This duplication comes from #4198 where updating of scales after initialization was fixed.

[benmccann]

The last few lines of updateConfig don't seem like they're updating the config at all. Maybe we should move them to update instead?

	chart.buildOrUpdateScales();

	// Tooltip
	chart.tooltip._options = newOptions.tooltips;
	chart.tooltip.initialize();

[kurkle]

Tooltip is iniatialized again in update. But I guess there is same issue in (re)moving that: plugins might expect Tooltip to be iniatialized.