formatStatistics: removing unnecessary imports

haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/BenchmarkJobManager.java

@@ -9,8 +9,6 @@ import java.nio.file.Files;
 import java.nio.file.InvalidPathException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
-import java.nio.file.StandardCopyOption;
-import java.text.MessageFormat;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.LinkedList;