ExtToolbar dock is not effect in react

[lumin824]

ext-web-components/packages/ext-web-components-classic/src/common/webcomponentsbase.js

Line 416 in a107759

case isClassicDock(childxtype):

i found this bug, fix need change "isClassicDock(childxtype)" to "isClassicDock(childCmp)"

[jnsencha]

Thanks @lumin824 I'll review this.