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

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73915 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.horizon/testsuite/test_r_horizon.py

@@ -30,7 +30,7 @@ ref2 = """azimuth,horizon_height
 280.000000,0.039774
 300.000000,0.032360
 320.000000,0.014804
-340.000000,0.000000
+340.000000,-0.001438
 360.000000,0.004724
 20.000000,0.012612
 40.000000,0.015207
@@ -51,7 +51,7 @@ ref3 = """azimuth,horizon_height
 280.000000,0.039774
 300.000000,0.032360
 320.000000,0.014804
-340.000000,0.000000
+340.000000,-0.001438
 360.000000,0.004724
 20.000000,0.012612
 40.000000,0.015207