Fix mistake in getting __version__ from __init__.py

Ska/engarchive/__init__.py

@@ -1,15 +1,14 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 
-# Get the version.  Ska.engarchive / cheta is a twisted case because the
-# package metadata can live either one or two directories above.  So just
-# try both.
-from setuptools_scm import get_version
-from pathlib import Path
-root = Path('..')
+from pkg_resources import get_distribution, DistributionNotFound
+
 try:
-    __version__ = get_version(root=root, relative_to=__file__)
-except LookupError:
-    __version__ = get_version(root=root / '..', relative_to=__file__)
+    # Normally use the generic __name__ here, but for the dual Ska.engarchive
+    # and cheta install, hardwire to 'Ska.engarchive' which is the package name.
+    __version__ = get_distribution('Ska.engarchive').version
+except DistributionNotFound:
+    # package is not installed
+    pass
 
 
 def test(*args, **kwargs):