Use unmodified MAKECMDGOALS in ninja.mk.

The build system removes targets like "PRODUCT-full-eng" from
MAKECMDGOALS in build/core/product_config.mk.
Without this change, such target isn't passed to kati.

Change-Id: I0b3949ed1f5557445d7f5d5bd59b7875c0b2ea7f
diff --git a/core/config.mk b/core/config.mk
index 7a90a0e..882ab0c 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -104,7 +104,7 @@
 # lines being executed, instead of a short message about
 # the kind of operation being done.
 SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))
-
+hide := $(if $(SHOW_COMMANDS),,@)
 
 # ###############################################################
 # Set common values