Fixed r.los (see #5734)

git-svn-id: http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin@222 881b9c09-3ef8-f3c2-ec3d-21d735c97f4d

Author: paolo.cavallini

src/sextante/grass/description/r.los.txt

@@ -3,7 +3,7 @@ r.los - Line-of-sight raster analysis program.
 Raster (r.*)
 ParameterRaster|input|Name of elevation raster map|False
 ParameterString|coordinate|Coordinate identifying the viewing position|0,0
-ParameterRaster|patt_map|Binary (1/0) raster map to use as a mask|False
+ParameterRaster|patt_map|Binary (1/0) raster map to use as a mask|True
 ParameterString|obs_elev|Viewing position height above the ground|1.75
 ParameterString|max_dist|Maximum distance from the viewing point (meters)|10000
 ParameterBoolean|-c|Consider earth curvature (current ellipsoid)|False