Some minor refactoring

client/android/src/org/amnezia/vpn/Prefs.kt

@@ -8,7 +8,7 @@ import org.amnezia.vpn.util.Log
 
 private const val TAG = "Prefs"
 private const val PREFS_FILE = "org.amnezia.vpn.prefs"
-private const val SECURE_PREFS_FILE = PREFS_FILE + ".secure"
+private const val SECURE_PREFS_FILE = "$PREFS_FILE.secure"
 
 object Prefs {
     fun get(context: Context, appContext: Context = context.applicationContext): SharedPreferences =
@@ -19,7 +19,7 @@ object Prefs {
                 MasterKey(appContext)
             )
         } catch (e: Exception) {
-            Log.e(TAG, "Getting Encryption Storage failed, plaintext fallback")
+            Log.e(TAG, "Getting Encryption Storage failed: ${e.message}, plaintext fallback")
             appContext.getSharedPreferences(PREFS_FILE, Context.MODE_PRIVATE)
         }
 }

client/android/wireguard/src/main/kotlin/org/amnezia/vpn/protocol/wireguard/Wireguard.kt

@@ -104,7 +104,7 @@ open class Wireguard : Protocol() {
             parseInetAddress(dns.trim())
         }?.forEach(::addDnsServer)
 
-        val defRoutes = listOf(
+        val defRoutes = hashSetOf(
             InetNetwork("0.0.0.0", 0),
             InetNetwork("::", 0)
         )
@@ -113,7 +113,7 @@ open class Wireguard : Protocol() {
             InetNetwork.parse(route.trim())
         }?.forEach(routes::add)
         // if the allowed IPs list contains at least one non-default route, disable global split tunneling
-        if (!routes.all { defRoutes.contains(it) }) disableSplitTunneling()
+        if (routes.any { it !in defRoutes }) disableSplitTunneling()
         addRoutes(routes)
 
         configData["MTU"]?.let { setMtu(it.toInt()) }