fix(b-link): remove default values from `vue-router` pass-down props (closes #6373) (#6374)
fix(b-link): remove default values from `vue-router` pass-down props (closes #6373) (#6374)

* fix(b-link): remove default values from `vue-router` passdown props

* Update link.js

* Update link.js
bootstrap-vue/bootstrap-vue,bootstrap-vue/bootstrap-vue