Fixing a typo in thing name header field
The header field for passing thing name in AWS IoT Credential Provider was incorrect. As per documentation, the header should be 'x-amz-iot-thingname'
/**
* @brief HTTP header name for specifying the IOT Thing resource name in request to AWS S3.
*/
-#define AWS_IOT_THING_NAME_HEADER_FIELD "x-amz-iot-thing-name"
+#define AWS_IOT_THING_NAME_HEADER_FIELD "x-amzn-iot-thingname"
/**
* @brief Field name of the HTTP date header to read from the AWS IOT credential provider server response.
