fix missed import in the Processing alg

Author: alexbruy

python/plugins/processing/algs/lidar/fusion/CanopyModel.py

@@ -32,6 +32,7 @@
 from processing.core.parameters import ParameterNumber
 from processing.core.parameters import ParameterSelection
 from processing.core.parameters import ParameterString
+from processing.core.parameters import ParameterBoolean
 from processing.core.outputs import OutputFile
 from FusionAlgorithm import FusionAlgorithm
 from FusionUtils import FusionUtils