gnrc_pktbuf_cmd: module is not a pktbuf implementation

When I introduced this pseudo-module in #9391 I did not consider, that
the way I named it, it is assumed to be an implementation of the
`gnrc_pktbuf` interface. However, it is not (it just provides the shell
command).

This PR excludes `gnrc_pktbuf_cmd` from the selection algorithm, so
that if it is the only `gnrc_pktbuf_%` module, still
`gnrc_pktbuf_static` gets selected.

Makefile.dep

@@ -520,6 +520,9 @@ ifneq (,$(filter gnrc_pktbuf, $(USEMODULE)))
   ifeq (,$(filter gnrc_pktbuf_%, $(USEMODULE)))
     USEMODULE += gnrc_pktbuf_static
   endif
+  ifeq (gnrc_pktbuf_cmd,$(filter gnrc_pktbuf_%, $(USEMODULE)))
+    USEMODULE += gnrc_pktbuf_static
+  endif
   USEMODULE += gnrc_pkt
 endif