chore(VInput): fix sass syntax error

introduced in 9caab87

Author: KaelWD

packages/vuetify/src/components/VInput/VInput.sass

@@ -61,7 +61,7 @@
       opacity: var(--v-medium-emphasis-opacity)
 
     .v-input--disabled &,
-    .v-input--error &,
+    .v-input--error &
       > .v-icon,
       .v-messages
         opacity: 1