Fix code style issues

mobile/src/main/java/com/github/shadowsocks/bg/LocalDnsService.kt

@@ -20,7 +20,6 @@
 
 package com.github.shadowsocks.bg
 
-import android.content.Context
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.acl.Acl
 import com.github.shadowsocks.preference.DataStore
@@ -50,10 +49,10 @@ object LocalDnsService {
             fun makeDns(name: String, address: String, timeout: Int, edns: Boolean = true): JSONObject {
                 val dns = JSONObject()
                 .put("Name", name)
-                .put("Address", (when (address.parseNumericAddress()) {
+                .put("Address", when (address.parseNumericAddress()) {
                     is Inet6Address -> "[$address]"
                     else -> address
-                }))
+                })
                 .put("Timeout", timeout)
                 .put("EDNSClientSubnet", JSONObject().put("Policy", "disable"))
                 if (edns) dns