global: optimize imports

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

tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java

@@ -5,14 +5,12 @@
 
 package com.wireguard.android.util;
 
-import com.wireguard.util.NonNullForAll;
-
 import android.content.Context;
-import androidx.annotation.Nullable;
 import android.system.OsConstants;
 import android.util.Log;
 
 import com.wireguard.android.util.RootShell.RootShellException;
+import com.wireguard.util.NonNullForAll;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -20,6 +18,8 @@ import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
 
+import androidx.annotation.Nullable;
+
 /**
  * Helper to install WireGuard tools to the system partition.
  */