Remove FixedTouchableHighlight , fix Android press issues (#3214)

* rm `FixedTouchableHighlight`

* adjust delay for highlight

* remove unnecessary background colors to support background ripple

src/view/com/post/Post.tsx

@@ -133,7 +133,7 @@ function PostInner({
   }, [setLimitLines])
 
   return (
-    <Link href={itemHref} style={[styles.outer, pal.view, pal.border, style]}>
+    <Link href={itemHref} style={[styles.outer, pal.border, style]}>
       {showReplyLine && <View style={styles.replyLine} />}
       <View style={styles.layout}>
         <View style={styles.layoutAvi}>