Remove useless shebang lines

Since these files do not have the executable bit set in their file
permissions, the shebang line (#!) does nothing.

For qtsass/cli.py, the file is not even script-like (the “main routine”
is only defined, not called, on import).

For the other three, setting the executable bit *could* be an
alternative, if people wanted to run e.g. “./run_checks_and_format.py”
instead of “python3 run_checks_and_format.py”.

Author: musicinmybrain

qtsass/__main__.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # -----------------------------------------------------------------------------
 # Copyright (c) 2015 Yann Lanthony

qtsass/cli.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # -----------------------------------------------------------------------------
 # Copyright (c) 2015 Yann Lanthony

run_checks_and_format.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # -----------------------------------------------------------------------------
 # Copyright (c) 2015 Yann Lanthony

setup.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # -----------------------------------------------------------------------------
 # Copyright (c) 2015 Yann Lanthony