[Glitch] minor server-sent events fixes

Port front-end changes from 6598ab989b to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/util/stream.js

@@ -92,6 +92,7 @@ export default function getStream(streamingAPIBaseURL, accessToken, stream, { co
     return ws;
   }
 
+  stream = stream.replace(/:/g, '/');
   params.push(`access_token=${accessToken}`);
   const es = new EventSource(`${streamingAPIBaseURL}/api/v1/streaming/${stream}?${params.join('&')}`);