fix processing gdal_rasterize: missing output format parameter

Author: Giovanni Manghi

python/plugins/processing/algs/gdal/rasterize.py

@@ -134,6 +134,8 @@ def getConsoleCommands(self):
         arguments.append('-ot')
         arguments.append(self.TYPE[self.getParameterValue(self.RTYPE)])
         dimType = self.getParameterValue(self.DIMENSIONS)
+        arguments.append('-of')
+        arguments.append(GdalUtils.getFormatShortNameFromFilename(out))        
         if dimType == 0:
             # size in pixels
             arguments.append('-ts')