test_aes: Replace spaces by tabs

This commit replaces spaces by tabs in the TinyCrypt AES test.

Three 'space required before the open brace' issues are also
fixed by this commit.

Change-Id: Ia50208d7a3f6fbb944e27d380b00b30fe88e2a58
Signed-off-by: Flavio Santes <[email protected]>

Author: 1010101001010101