refactor(VTextField): use border-image instead of border-style
refactor(VTextField): use border-image instead of border-style

see 2dec42ac and #4615

Phlow2001/vuetify,Phlow2001/vuetify,Webifi/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,vuetifyjs/vuetify,Webifi/vuetify,Webifi/vuetify