slapos_json_rpc_api: fixup compute node retrieval

master/bt5/slapos_json_rpc_api/SkinTemplateItem/portal_skins/slapos_jio_api/jIOWebSection_createSoftwareInstallation.py

@@ -4,7 +4,10 @@ class RequestFailsError(JsonRpcAPIError):
   type = "SUPPLY-FAILED"
   status = 403
 
-compute_node = context.jIOWebSection_getObjectFromData(data_dict)
+compute_node = context.jIOWebSection_getObjectFromData({
+  'portal_type': 'Compute Node',
+  'compute_node_id': data_dict['compute_node_id']
+})
 
 compute_node.requestSoftwareRelease(
   software_release_url=data_dict["software_release_uri"],