修复了消息中心红点在android显示不全的问题。review by days。

@@ -116,11 +116,13 @@ let styles = StyleSheet.create({
     },
     iconContainer: {
       flexDirection:'row',
-      marginLeft: 15,
-      marginRight: 15,
+      paddingLeft: 15,
+      paddingRight: 15,
+      paddingTop: 10,
+      paddingBottom: 10,
       backgroundColor: 'transparent',
-      width: 50,
-      height: 50,
+      width: 80,
+      height: 70,
     },
     iconStyle: {
       backgroundColor: 'transparent',