xtest: pkcs11_1009: remove trailing space characters

As advised by the Linux kernel coding style [1] which OP-TEE follows:

  [...] don't leave whitespace at the end of lines.

[1] https://www.kernel.org/doc/html/latest/process/coding-style.html#indentation


Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>