Further modifications on the texture_diff filter

	modified:   pandora_vision_hole_detector/cfg/hole_fusion_cfg.cfg
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/rgb_filters.cpp
	modified:   pandora_vision_hole_detector/src/utils/parameters.cpp
	modified:   pandora_vision_hole_detector/test/unit/hole_fusion_node/rgb_filters_test.cpp