debug: Add dd into debug module

When at it also deduplicate the list of installed utilities.

modules.d/95debug/module-setup.sh

@@ -13,9 +13,9 @@ depends() {
 
 # called by dracut
 install() {
-    inst_multiple -o cat ls ps grep more cat rm strace free showmount \
-                  ping netstat rpcinfo vi scp ping6 ssh find vi \
-                  tcpdump cp less hostname mkdir systemd-analyze \
+    inst_multiple -o ls ps grep more cat rm strace free showmount \
+                  ping netstat rpcinfo vi scp ping6 ssh find \
+                  tcpdump cp dd less hostname mkdir systemd-analyze \
                   fsck fsck.ext2 fsck.ext4 fsck.ext3 fsck.ext4dev fsck.f2fs fsck.vfat e2fsck
 
     grep '^tcpdump:' /etc/passwd 2>/dev/null >> "$initdir/etc/passwd"