Bug 1078114 - Support tv_apps directory for CardUI related apps

* Fix APP_TEST_LIST listing for tv_apps directory
I prefer this one

APP_TEST_LIST=$(shell find -L $(GAIA_DIR)$(SEP)apps$(SEP)$(APP) $(GAIA_DIR)$(SEP)dev_apps$(SEP)$(APP) $(GAIA_DIR)$(SEP)tv_apps$(SEP)$(APP) -name '*_test.js' 2> /dev/null | grep '/test/unit/')