fix add-alias modal error message style (#23625)

* fix add-alias modal error message style

* story

Author: songgao

shared/stories/__tests__/__snapshots__/Storyshots.test.js.snap

@@ -109,7 +109,7 @@ export const AddAliasModal = (props: Props) => {
           style={Styles.collapseStyles([!emoji && styles.opacity40])}
         >
           <Kb.Text type="BodySemibold">Enter an alias:</Kb.Text>
-          <Kb.Box2 direction="horizontal" fullWidth={true} style={styles.aliasInputContainer}>
+          <Kb.Box2 direction="horizontal" fullWidth={true}>
             <AliasInput
               ref={aliasInputRef}
               error={error}
@@ -205,14 +205,6 @@ const emojiPadding = 4
 const singleEmojiWidth = emojiWidthWithPadding - 2 * emojiPadding
 
 const styles = Styles.styleSheetCreate(() => ({
-  aliasInputContainer: Styles.platformStyles({
-    isElectron: {
-      height: Styles.globalMargins.large,
-    },
-    isMobile: {
-      height: Styles.globalMargins.large + 3 * Styles.globalMargins.xxtiny,
-    },
-  }),
   container: Styles.platformStyles({
     common: {
       ...Styles.globalStyles.flexGrow,