apps/st_things : Fix kconfig syntax error.
apps/st_things : Fix kconfig syntax error.

It should have let each example select one. but it does contain the unnecessary. So I fix the syntax.

jeongarmy/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,btheosam/TizenRT,HONGCHAEHEE/TizenRT,davidfather/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,davidfather/TizenRT,chanijjani/TizenRT,lokeshbv/TizenRT,HONGCHAEHEE/TizenRT,jeongarmy/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,jsdosa/TizenRT,pillip8282/TizenRT,an4967/TizenRT,JeonginKim/TizenRT,lokeshbv/TizenRT,pillip8282/TizenRT,davidfather/TizenRT,btheosam/TizenRT,junmin-kim/TizenRT,btheosam/TizenRT,pillip8282/TizenRT,an4967/TizenRT,lokeshbv/TizenRT,HONGCHAEHEE/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,chanijjani/TizenRT,btheosam/TizenRT,davidfather/TizenRT,lokeshbv/TizenRT,jeongarmy/TizenRT,chanijjani/TizenRT,davidfather/TizenRT,jeongarmy/TizenRT,sunghan-chang/TizenRT,chanijjani/TizenRT,btheosam/TizenRT,an4967/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,junmin-kim/TizenRT,chanijjani/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,Samsung/TizenRT,JeonginKim/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,an4967/TizenRT,jsdosa/TizenRT,jeongchanKim/TizenRT,chanijjani/TizenRT,sunghan-chang/TizenRT,junmin-kim/TizenRT,btheosam/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,jeongchanKim/TizenRT,davidfather/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,JeonginKim/TizenRT,Samsung/TizenRT,lokeshbv/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,JeonginKim/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,pillip8282/TizenRT,lokeshbv/TizenRT,HONGCHAEHEE/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,JeonginKim/TizenRT,pillip8282/TizenRT,HONGCHAEHEE/TizenRT,jeongchanKim/TizenRT,chanijjani/TizenRT,an4967/TizenRT,davidfather/TizenRT,JeonginKim/TizenRT,junmin-kim/TizenRT,HONGCHAEHEE/TizenRT