normalize existing emacs/vim mode-lines in python files

Bunch of these were setting C++ or Make modes and icky tabs...

Also, reportedly Emacs can figure out to enable python-mode
automatically.

Change-Id: I50072488fb92cb4d27aa3f74f717a28ae3967543

scripting/source/pyprov/msgbox.py

@@ -1,5 +1,4 @@
-# -*- tab-width: 4; indent-tabs-mode: nil -*-
-#
+# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
 #
 # This file is part of the LibreOffice project.
 #
@@ -238,3 +237,5 @@ if __name__ == '__main__':
     myBox.numberOflines = 2
 
     print(myBox.show("A small message",0,"Dialog title"))
+
+# vim: set shiftwidth=4 softtabstop=4 expandtab:

scripting/source/pyprov/pythonscript.py

@@ -1,3 +1,4 @@
+# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
 #
 # This file is part of the LibreOffice project.
 #
@@ -1077,3 +1078,4 @@ g_ImplementationHelper.addImplementation( \
 
 log.debug( "pythonscript finished intializing" )
 
+# vim: set shiftwidth=4 softtabstop=4 expandtab: