fix(prefix position): provide margin-top (#6956)

fixes #6942

Author: blalan05

packages/vuetify/src/stylus/components/_text-fields.styl

@@ -292,6 +292,7 @@ rtl(v-text-field-rtl, "v-text-field")
       border-radius: 4px
 
     .v-text-field__prefix
+      margin-top: 22px
       max-height: 32px
 
     .v-input__prepend-outer,