Add fix for bug #2239 (#2241)
Add fix for bug #2239 (#2241)

This only fixes the css for text-fields for bug https://github.com/vuetifyjs/vuetify/issues/2239. Is it more appropriate to add these code to individual component css or make a global declaration for .input-group__details and .input-group__input.
```
.input-group__details, .input-group__input
  user-select: none
```
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