Update portal.properties init script

Underscores interfere with use as host name on tomcat

config/init.sh

@@ -5,6 +5,6 @@ SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 VERSION=$(grep DOCKER_IMAGE_CBIOPORTAL ../.env | cut -d '=' -f 2-)
 
 docker run --rm -it $VERSION cat /cbioportal-webapp/WEB-INF/classes/portal.properties | \
-    sed 's/db.host=.*/db.host=cbioportal_database:3306/g' | \
-    sed 's|db.connection_string=.*|db.connection_string=jdbc:mysql://cbioportal_database:3306/|g' \
+    sed 's/db.host=.*/db.host=cbioportal-database:3306/g' | \
+    sed 's|db.connection_string=.*|db.connection_string=jdbc:mysql://cbioportal-database:3306/|g' \
 > portal.properties