Codemirror: Enabled non-standard self-closing tags

For #5078

Author: ssddanbrown

resources/js/code/languages.js

@@ -35,7 +35,7 @@ const modeMap = {
     go: () => legacyLoad('go'),
     haskell: () => legacyLoad('haskell'),
     hs: () => legacyLoad('haskell'),
-    html: async () => html(),
+    html: async () => html({selfClosingTags: true}),
     ini: () => legacyLoad('properties'),
     java: () => legacyLoad('java'),
     javascript: async () => javascript(),