Enable test in osgeo4w_gunittest.cfg

Author: echoix

.github/workflows/osgeo4w_gunittest.cfg

@@ -5,7 +5,6 @@
 # but it includes mainly tests which can (and should) be fixed.
 exclude =
     gui/wxpython/core/testsuite/toolboxes.sh
-    lib/init/testsuite/test_grass_tmp_mapset.py
     python/grass/gunittest/testsuite/test_gunitest_doctests.py
     python/grass/pygrass/raster/testsuite/test_pygrass_raster_doctests.py
     python/grass/pygrass/rpc/testsuite/test_pygrass_rpc_doctests.py