SDSS-1394: Update stanford_circle image style image mask file path (#… #298

Job	Run time
tests / PHPUnit Coverage Tests	6m 58s
tests / Test Sustainability Site Sync	10m 24s
tests / Test New Site (acceptance)	18m 15s
tests / Test New Site (functional)	10m 28s
deploy / Deploy Artifact	1m 50s
	47m 55s

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