PWA: allow connecting to URLs with the wss: protocol.

Author: paveloom

pwa/index.html

@@ -7,7 +7,7 @@
       name="viewport"
     />
     <meta
-      content="default-src 'self'; base-uri 'self'; form-action 'none'; object-src 'none'; connect-src https:;"
+      content="default-src 'self'; base-uri 'self'; form-action 'none'; object-src 'none'; connect-src https: wss:;"
       http-equiv="Content-Security-Policy"
     />
     <title>Flowey</title>