Properly format SConscript files

Partially resolves COMPMID-5287

Change-Id: I65a95eb978908bed0a3c7d385c4c4f171f3b2c86
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7605
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: SiCong Li <sicong.li@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/SConscript b/tests/SConscript
index 87907f4..49bcb8e 100644
--- a/tests/SConscript
+++ b/tests/SConscript
@@ -1,3 +1,4 @@
+#!/usr/bin/python
 # -*- coding: utf-8 -*-
 
 # Copyright (c) 2017-2022 Arm Limited.