Remove shebang from footprint wizard plugin

Fedora packaging errors with ambiguous python shebang since current
rawhide (30).

So we should remove it as the footprint wizards are not to be executed
standalone.

pcbnew/python/plugins/touch_slider_wizard.py

@@ -1,5 +1,3 @@
-#!/usr/bin/python
-
 #
 # This program source code file is part of KiCad, a free EDA CAD application.
 #