fix s3 `secretKeys.sse_c_key` secret key checking typo; now `sse_c_key` is not required for using s3 with this chart #1115

Job	Run time
changes	6s
lint	51s
test (Default - no custom values)	1m 38s
test (PostgreSQL Enabled, --helm-extra-set-args "--set=postgresql.enabled=true --set=postgresql.g...	2m 29s
test (Nginx Enabled, --helm-extra-set-args "--set=image.flavor=fpm --set=nginx.enabled=true")	1m 50s
test (Horizontal Pod Autoscaling Enabled, --helm-extra-set-args "--set=hpa.enabled=true --set=hpa...	1m 39s
test (S3 Enabled as Primary Storage, --namespace nextcloud --skip-clean-up --helm-extra-set-args ...	2m 1s
summary	5s
	10m 39s

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