fix(VField): min-height calculation incorrect

without designating px, calc was returning the 0 fallback as integer instead of px
which was ultimately returning auto

Author: John Leider

packages/vuetify/src/components/VField/_variables.scss

@@ -42,7 +42,7 @@ $field-input-min-height: #{max(
   var(--v-input-control-height, $input-control-height),
   calc($input-font-size * $input-line-height + var(--v-field-input-padding-top) + var(--v-field-input-padding-bottom))
 )} !default;
-$field-input-padding-top: calc(var(--v-field-padding-top, $field-control-padding-top) + var(--v-input-padding-top, 0)) !default;
+$field-input-padding-top: calc(var(--v-field-padding-top, $field-control-padding-top) + var(--v-input-padding-top, 0px)) !default;
 $field-input-padding-bottom: var(--v-field-padding-bottom, $field-control-padding-bottom) !default;
 $field-input-column-gap: 2px !default;
 $field-input-row-gap: 8px !default;