removed unused imports

main/ui/src/main/java/org/cryptomator/ui/traymenu/FxApplicationStarter.java

@@ -9,9 +9,7 @@ import org.slf4j.LoggerFactory;
 import javax.inject.Inject;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionStage;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
 
 @TrayMenuScoped
 public class FxApplicationStarter {