coverage-reporting: Use proper shell shebanh line

For scripts to be runnable, the first line should start with "#!" (no
spaces).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
diff --git a/coverage-tool/coverage-reporting/merge.py b/coverage-tool/coverage-reporting/merge.py
index 827d314..9890582 100755
--- a/coverage-tool/coverage-reporting/merge.py
+++ b/coverage-tool/coverage-reporting/merge.py
@@ -1,4 +1,4 @@
-# !/usr/bin/env python
+#!/usr/bin/env python
 ###############################################################################
 # Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
 #