Azure: fix error on resolving image version with multiple locations.

The original code hasn't use the latest runbook to resolve image. So the location is not set to single value.

lisa/sut_orchestrator/azure/platform_.py

@@ -566,7 +566,9 @@ def _prepare_environment(self, environment: Environment, log: Logger) -> bool:
 
         # resolve Latest to specified version
         if is_success:
-            self._resolve_marketplace_image_version(nodes_requirement)
+            self._resolve_marketplace_image_version(
+                environment.runbook.nodes_requirement
+            )
 
         return is_success