fix(nginx): _assets should rewrite to _static/sentry/dist (#1719)

See getsentry/self-hosted@01d7741

Author: motoki317

charts/sentry/templates/configmap-nginx.yaml

@@ -53,6 +53,11 @@ data:
         proxy_pass http://sentry;
       }
 
+      location /_assets/ {
+        proxy_pass http://sentry/_static/dist/sentry/;
+        proxy_hide_header Content-Disposition;
+      }
+
       location /_static/ {
         proxy_pass http://sentry;
         proxy_hide_header Content-Disposition;