refactor(tlc): fix static check errors and code style

Change-Id: I8cbe5ee940d409ed3f81f792c2ade0b93287ae62
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/tools/tlc/tests/test_cli.py b/tools/tlc/tests/test_cli.py
index 99b5816..4fad349 100644
--- a/tools/tlc/tests/test_cli.py
+++ b/tools/tlc/tests/test_cli.py
@@ -9,12 +9,11 @@
 
 """Contains unit tests for the CLI functionality."""
 
+from math import ceil, log2
 from pathlib import Path
 from unittest import mock
-from math import log2, ceil
 
 import pytest
-import pytest
 import yaml
 from click.testing import CliRunner