Revert "Promote default settings to kcptun"

This reverts commit 99ff47bd5f.

See discussion at: https://github.com/shadowsocks/kcptun/pull/1

src/main/scala/com/github/shadowsocks/database/DBHelper.scala

@@ -129,9 +129,11 @@ class DBHelper(val context: Context)
 
       if (oldVersion < 17) {
         profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcp SMALLINT;")
-        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcpcli VARCHAR DEFAULT '--nocomp';")
+        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN kcpcli VARCHAR DEFAULT " +
+          "'--crypt none --mode normal --mtu 1200 --nocomp --dscp 46 --parityshard 0';")
       } else if (oldVersion < 20) {
-        profileDao.executeRawNoArgs("UPDATE `profile` SET kcpcli = '--nocomp' WHERE kcpcli IS NULL;")
+        profileDao.executeRawNoArgs("UPDATE `profile` SET kcpcli = '--crypt none --mode normal --mtu 1200 --nocomp " +
+          "--dscp 46 --parityshard 0' WHERE kcpcli IS NULL;")
       }
 
       if (oldVersion < 18) {

src/main/scala/com/github/shadowsocks/database/Profile.scala

@@ -106,7 +106,7 @@ class Profile {
   var kcpPort: Int = 8399
 
   @DatabaseField
-  var kcpcli: String = "--nocomp"
+  var kcpcli: String = "--crypt none --mode normal --mtu 1200 --nocomp --dscp 46 --parityshard 0"
 
   override def toString = "ss://" + Base64.encodeToString("%s%s:%s@%s:%d".formatLocal(Locale.ENGLISH,
     method, if (auth) "-auth" else "", password, host, remotePort).getBytes, Base64.NO_PADDING | Base64.NO_WRAP)