fix(inputs): restore plain/underlined icon alignment

partially reverts f483092

Author: KaelWD

packages/vuetify/src/components/VFileInput/VFileInput.tsx

@@ -252,6 +252,7 @@ export const VFileInput = genericComponent<VFileInputSlots>()({
               'v-file-input--chips': !!props.chips,
               'v-file-input--dragging': isDragging.value,
               'v-file-input--hide': props.hideInput,
+              'v-input--plain-underlined': isPlainOrUnderlined.value,
             },
             props.class,
           ]}

packages/vuetify/src/components/VTextField/VTextField.tsx

@@ -183,6 +183,7 @@ export const VTextField = genericComponent<VTextFieldSlots>()({
             {
               'v-text-field--prefixed': props.prefix,
               'v-text-field--suffixed': props.suffix,
+              'v-input--plain-underlined': isPlainOrUnderlined.value,
             },
             props.class,
           ]}

packages/vuetify/src/components/VTextarea/VTextarea.tsx

@@ -263,6 +263,7 @@ export const VTextarea = genericComponent<VTextareaSlots>()({
               'v-text-field--suffixed': props.suffix,
               'v-textarea--auto-grow': props.autoGrow,
               'v-textarea--no-resize': props.noResize || props.autoGrow,
+              'v-input--plain-underlined': isPlainOrUnderlined.value,
             },
             props.class,
           ]}