r.horizon: fix test_raster_mode_one_direction for https://trac.osgeo.org/grass/changeset/73049 (allow negative angles)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73916 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.horizon/testsuite/test_r_horizon.py

@@ -106,7 +106,7 @@ class TestHorizon(TestCase):
         module = SimpleModule('r.horizon', elevation='elevation',
                               output=self.horizon_output, direction=50)
         self.assertModule(module)
-        ref = {'min': 0, 'max': 0.70678365230560, 'stddev': 0.0360724286360789}
+        ref = {'min': -1.57079637050629, 'max': 0.70678365230560, 'stddev': 0.0708080140468585}
         self.assertRasterFitsUnivar(raster='test_horizon_output_from_elevation_050', reference=ref, precision=1e6)
 
     def test_raster_mode_multiple_direction(self):