Update CEF agent installation command

Update connector json with addition of -O cef_installer.py  to instruction step 1.2 for CEF collector installation.

DataConnectors/WireXsystemsNFP(1b).json

@@ -93,7 +93,7 @@
                                     "PrimaryKey"
                                 ],
                                 "label": "Run the following command to install and apply the CEF collector:",
-                                "value": "sudo wget https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/DataConnectors/CEF/cef_installer.py&&sudo python cef_installer.py {0} {1}"
+                                "value": "sudo wget -O cef_installer.py https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/DataConnectors/CEF/cef_installer.py&&sudo python cef_installer.py {0} {1}"
                             },
                             "type": "CopyableLabel"
                         }