Change test description (Minor change)

Author: m-kuhn

tests/src/python/test_provider_shapefile.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-"""QGIS Unit tests for the postgres provider.
+"""QGIS Unit tests for the OGR/Shapefile provider.
 
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 it under the terms of the GNU General Public License as published by