fix(ui): Fix QPopupProxy.currentComponent API def
fix(ui): Fix QPopupProxy.currentComponent API def

See https://github.com/quasarframework/quasar/blob/fd616b58026d3a5caaef8ae43ea65bae6cac6c02/ui/src/components/popup-proxy/QPopupProxy.js#L71-L74
quasarframework/quasar,quasarframework/quasar,quasarframework/quasar,quasarframework/quasar