Remove dangling reference to myResourceGroup

Author: Erik Parmann

environment_setup/arm-templates/aci-password.json

@@ -19,7 +19,7 @@
     ,    "outputs": {
         "password": {
             "type": "string",
-            "value": "[listCredentials(resourceId('myResourceGroup','Microsoft.ContainerRegistry/registries',parameters('acr')),'2019-05-01').passwords[1].value]"
+            "value": "[listCredentials(resourceId('Microsoft.ContainerRegistry/registries',parameters('acr')),'2019-05-01').passwords[1].value]"
         },
         "username": {
             "type": "string",