Fix user-journey leaking css

This fixes a CSS syntax error that causes the CSS parser to soft-fail, which leads to the later CSS (custom styles) to not properly append the `#id` to them.

src/diagrams/user-journey/styles.js

@@ -132,8 +132,6 @@ const getStyles = (options) =>
   .actor-5 {
     ${options.actor5 ? `fill: ${options.actor5}` : ''};
   }
-
-  }
 `;
 
 export default getStyles;