Revert "increased height of victims for testing in simulation"

This reverts commit a8988d813dd002f9b7813e06cc814ec99e119246.
hector_worldmodel: added worldmodel merging function
hector_object_tracker: fixed model merging
hector_object_tracker: updated Object/ObjectModel API and removed
duplicate pose storage
worldmodel_msgs: added ObjectState INACTIVE and worldmodel_msgs/constants/ObjectState.h header file
worldmodel_msgs: fixed constants/ObjectState.h
hector_object_tracker: added negative update (partially fixes #6)
hector_object_tracker: fixed object orientation
hector_object_tracker: enabled negative update in launch file
reduced max height for final run
hector_object_tracker: added parameter min_support (default 0.0) for
negative updates
hector_object_tracker: removed Setting object state log message if state
has not been changed
hector_object_tracker: fixed state flow graph
hector_object_tracker: updated visualization marker text and color for
UNKNOWN, PENDING, INACTIVE victims
hector_object_tracker: set active support for qrcodes to 1.0 (to
visualize them correctly)
hector_worldmodel_geotiff_plugins: do not add DISCARDED objects
independent of class_id