director: fix the naming

device in director = name in sd

bareos-dir.d/tape.conf

@@ -1,7 +1,7 @@
 Storage {
-  Name = LTO-7
+  Name = LTO7
   Media Type = LTO-7
   Address = lto7                # N.B. Use a fully qualified name here
   Password = "Ia+A/4PGvr4kFgI9CYOZX73qqRXqUi8llZNymggM3k18"
-  Device = tape
+  Device = LTO-7
 }