Enable http2 on missing nginx configurations

deploy/docker.proxy.template

@@ -14,8 +14,8 @@ server {
     location / { return 301 https://$host$request_uri; }
 }
 server {
-    listen      443 ssl;
-    listen [::]:443 ssl;
+    listen      443 ssl http2;
+    listen [::]:443 ssl http2;
     server_name ${FUNKWHALE_HOSTNAME};
 
     # TLS

deploy/nginx.template

@@ -22,8 +22,8 @@ map $http_upgrade $connection_upgrade {
 }
 
 server {
-    listen      443 ssl;
-    listen [::]:443 ssl;
+    listen      443 ssl http2;
+    listen [::]:443 ssl http2;
     server_name ${FUNKWHALE_HOSTNAME};
 
     # TLS