Update mayastor-diskpool.json

Signed-off-by: Dimitris Zervas <[email protected]>
Signed-off-by: Abhilash Shetty <[email protected]>

Author: dzervas

deploy/charts/dashboards/mayastor/mayastor-diskpool.json

@@ -798,7 +798,7 @@
             },
             "datasource": {
                "type": "prometheus",
-               "uid": "prometheus"
+               "uid": "${datasource}"
             },
             "definition": "label_values(diskpool_status,name)",
             "hide": 0,