Riot filename changed

src/freedombone-app-riot

 SHOW_ON_ABOUT=1
 
 RIOT_VERSION='0.11.4'
-RIOT_FILENAME="vector-v${RIOT_VERSION}"
+RIOT_FILENAME="riot-v${RIOT_VERSION}"
 RIOT_HASH='792b8eb398ec08c6f32f64b27f92d31d658c6d2338c1e43c84136f25f64d1cb2'
 RIOT_DOWNLOAD_URL="https://github.com/vector-im/riot-web/releases/download/v${RIOT_VERSION}"
 RIOT_ONION_PORT=8115