Update TextInput.tsx

There are still reports of text not wrapping #571

src/screens/Compose/Root/Header/TextInput.tsx

@@ -30,6 +30,8 @@ const ComposeTextInput: React.FC = () => {
         paddingBottom: StyleConstants.Spacing.M,
         marginHorizontal: StyleConstants.Spacing.Global.PagePadding,
         color: colors.primaryDefault,
+        borderBottomWidth: 0.5,
+        borderBottomColor: colors.backgroundDefaultTransparent,
         fontSize: adaptedFontsize,
         lineHeight: adaptedLineheight
       }}