Move javascript.statements.default.exports to exports.default; remove default.switch (#5869)
Move javascript.statements.default.exports to exports.default; remove default.switch (#5869)

* Move default keyword under switch/export keywords

* Remove switch.default
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data