perf: call getIconbackgrounds once

instead of 20x on topic/topic list load

src/controllers/api.js

@@ -88,7 +88,6 @@ apiController.loadConfig = async function (req) {
 		thumbs: {
 			size: meta.config.topicThumbSize,
 		},
-		iconBackgrounds: await user.getIconBackgrounds(req.uid),
 		emailPrompt: meta.config.emailPrompt,
 		useragent: req.useragent,
 		fontawesome: {