matrix: explicitly define homeserver port in well-known config

More details can be found at: https://matrix-org.github.io/synapse/latest/delegate.html

Change-Id: I38f0e702398e11b74c89e9305c49a8024eb1df23
diff --git a/charts/matrix/templates/well-known.yaml b/charts/matrix/templates/well-known.yaml
index 8370de5..33e4b94 100644
--- a/charts/matrix/templates/well-known.yaml
+++ b/charts/matrix/templates/well-known.yaml
@@ -66,7 +66,7 @@
                 add_header Access-Control-Allow-Origin *;
             }
             location /.well-known/matrix/server {
-                return 200 '{"m.server": "https://{{ .Values.subdomain }}.{{ .Values.domain }}"}';
+                return 200 '{"m.server": "{{ .Values.subdomain }}.{{ .Values.domain }}:443"}';
                 default_type application/json;
                 add_header Access-Control-Allow-Origin *;
             }