fix: Fix variables not being properly set for external proxy internal routing

Author: sparkison

start-container

@@ -46,7 +46,7 @@ if [ "${M3U_PROXY_ENABLED}" = "true" ]; then
     export M3U_PROXY_START_EMBEDDED="false"
 
     # Should be in the format: m3u-proxy:38085
-    export M3U_PROXY_NGINX_TARGET=${M3U_PROXY_HOST:-localhost}:${M3U_PROXY_PORT:-8085}
+    export M3U_PROXY_NGINX_TARGET="${M3U_PROXY_HOST}:${M3U_PROXY_PORT}"
 
     # For external proxy, use provided token
     export M3U_PROXY_TOKEN="${M3U_PROXY_TOKEN}"