Increase default number of web workers to 4 to solve federation issues

deploy/env.prod.sample

@@ -36,7 +36,7 @@ FUNKWHALE_API_IP=127.0.0.1
 FUNKWHALE_API_PORT=5000
 # The number of web workers to start in parallel. Higher means you can handle
 # more concurrent requests, but also leads to higher CPU/Memory usage
-FUNKWHALE_WEB_WORKERS=1
+FUNKWHALE_WEB_WORKERS=4
 # Replace this by the definitive, public domain you will use for
 # your instance. It cannot be changed after initial deployment
 # without breaking your instance.