global: cleanup code style

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

tunnel/src/main/java/com/wireguard/android/backend/BackendException.java

@@ -11,6 +11,7 @@ import com.wireguard.util.NonNullForAll;
 public final class BackendException extends Exception {
     private final Object[] format;
     private final Reason reason;
+
     public BackendException(final Reason reason, final Object... format) {
         this.reason = reason;
         this.format = format;

tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java

@@ -42,6 +42,7 @@ public final class GoBackend implements Backend {
     @Nullable private Config currentConfig;
     @Nullable private Tunnel currentTunnel;
     private int currentTunnelHandle = -1;
+
     public GoBackend(final Context context) {
         SharedLibraryLoader.loadSharedLibrary(context, "wg-go");
         this.context = context;

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

@@ -189,6 +189,7 @@ public class RootShell {
     public static class RootShellException extends Exception {
         private final Object[] format;
         private final Reason reason;
+
         public RootShellException(final Reason reason, final Object... format) {
             this.reason = reason;
             this.format = format;