tests/tcg: Fix target-specific Makefile variables path for user-mode

Commit 812b31d3 refactor missed to update this path.

Fixes: 812b31d3 ("configs: rename default-configs to configs and reorganise")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20211226001541.3807919-1-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/tcg/Makefile.target

@@ -33,7 +33,7 @@ all:
 -include ../../../config-host.mak
 -include ../config-$(TARGET).mak
 ifeq ($(CONFIG_USER_ONLY),y)
--include $(SRC_PATH)/default-configs/targets/$(TARGET).mak
+-include $(SRC_PATH)/configs/targets/$(TARGET)/default.mak
 endif
 
 # for including , in command strings