Remove unused import in Archive

Change-Id: I0bc82e74f4acedb059322c29e13352151165ef7f

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Archive.java

@@ -43,7 +43,6 @@
 
 package org.eclipse.jgit.pgm;
 
-import org.eclipse.jgit.api.ArchiveCommand;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.archive.ArchiveFormats;