feature: ARSN-2 fix renamed encryption helper
feature: ARSN-2 fix renamed encryption helper

The name of the Cloudserver config helper "isAWSServerSideEncrytion"
has been renamed to "isAWSServerSideEncryption" to fix a typo, in commit
https://github.com/scality/cloudserver/pull/3708/commits/f336541f6acd0226eab26bd668dea921f8c5d69c

This new name needs to be fixed in the AwsBackend data location.

scality/Arsenal,scality/Arsenal