update malware doc images

docs/doxygen-user/ct_malware_scanner.dox

...mages/Malware-scanner-global-options-panel-no-license.png

docs/doxygen-user/images/malware-artifact-tree.png

...mages/malware-scanner-global-options-panel-no-license.png

...ygen-user/images/malware-scanner-global-options-panel.png