v-m: Correct vmalert remote read/write URLs

*vmalert* has been generating alerts and triggering notifications, but
not writing any `ALERTS`/`ALERTS_FOR_STATE` metrics.  It turns out this
is because I had not correctly configured the remote read/write
URLs.

victoria-metrics/vmalert.yaml

@@ -45,10 +45,10 @@ spec:
           value: /rules/*.yml
         - name: vmalert_datasource_url
           value: http://vmselect:8481/select/1/prometheus
-        - name: vmalert_remoteread_url
+        - name: vmalert_remoteRead_url
           value: http://vmselect:8481/select/1/prometheus
-        - name: vmalert_remorewrite_url
-          value: http://vminsert:8480/select/1/prometheus
+        - name: vmalert_remoteWrite_url
+          value: http://vminsert:8480/insert/1/prometheus
         - name: vmalert_notifier_url
           value: http://alertmanager:9093
         ports: