Fix initialization of autocreate and use_ssl

According to the documentation, both `OBJECTSTORE_S3_SSL` and
`OBJECTSTORE_S3_AUTOCREATE` should default to `true`.
Currently, when these environment variables are not set, they default to
`false`. (See #2308).

This fix works, because `strtolower(false)` returns the empty string. So
when `OBJECTSTORE_S3_SSL` is not set and `getenv('OBJECTSTORE_S3_SSL')`
returns `false`, the check `strtolower($use_ssl) !== 'false'` will
evaluate to `true`.

With this fix, both values will be `true` if they are

* not set
* the empty string
* any string that is not equal to `false` when converted to lowercase

This should now match the documented behavior.

.config/s3.config.php

@@ -14,8 +14,8 @@
         'port' => getenv('OBJECTSTORE_S3_PORT') ?: '',
         'storageClass' => getenv('OBJECTSTORE_S3_STORAGE_CLASS') ?: '',
         'objectPrefix' => getenv("OBJECTSTORE_S3_OBJECT_PREFIX") ? getenv("OBJECTSTORE_S3_OBJECT_PREFIX") : "urn:oid:",
-        'autocreate' => (strtolower($autocreate) === 'false' || $autocreate == false) ? false : true,
-        'use_ssl' => (strtolower($use_ssl) === 'false' || $use_ssl == false) ? false : true,
+        'autocreate' => strtolower($autocreate) !== 'false',
+        'use_ssl' => strtolower($use_ssl) !== 'false',
         // required for some non Amazon S3 implementations
         'use_path_style' => $use_path == true && strtolower($use_path) !== 'false',
         // required for older protocol versions