global: optimize imports

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

tunnel/src/main/java/com/wireguard/crypto/Curve25519.java

@@ -8,10 +8,10 @@ package com.wireguard.crypto;
 
 import com.wireguard.util.NonNullForAll;
 
-import androidx.annotation.Nullable;
-
 import java.util.Arrays;
 
+import androidx.annotation.Nullable;
+
 /**
  * Implementation of the Curve25519 elliptic curve algorithm.
  * <p>

tunnel/src/main/java/com/wireguard/crypto/Key.java

@@ -5,9 +5,8 @@
 
 package com.wireguard.crypto;
 
-import com.wireguard.util.NonNullForAll;
-
 import com.wireguard.crypto.KeyFormatException.Type;
+import com.wireguard.util.NonNullForAll;
 
 import java.security.MessageDigest;
 import java.security.SecureRandom;