Remove shebang in non main module files

lemi2seed/lemi_data.py

-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 """
 Routines for data prep before conversion to mseed files.

lemi2seed/utils.py

-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 """
 Various "utils" functions required for data and metadata formatting and