Enable offline installation for all images except NETINST

We recently switched from DVD to BD (Bluray Disc) because the image
didn't fit in a single layer DVD anymore and that changed broke
a further check enabling the offline logic.

simple-cdd/simple-cdd.conf

@@ -29,13 +29,13 @@
 # To automatically select profiles (must also be listed in profiles):
 # auto_profiles="foo bar baz"
 
-if [ "$DISKTYPE" = "DVD" ]; then
+if [ "$DISKTYPE" = "NETINST" ]; then
+    profiles="kali"
+    auto_profiles="kali"
+else
     # Enable offline installation for full installer image
     profiles="kali offline"
     auto_profiles="kali offline"
-else
-    profiles="kali"
-    auto_profiles="kali"
 fi
 
 # To include profiles which only effect the CD build