refactor(avoidance): rename param (autowarefoundation#923)

Signed-off-by: satoshi-ota <satoshi.ota928@gmail.com>

Author: satoshi-ota

autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/avoidance/avoidance.param.yaml

@@ -154,7 +154,7 @@
           backward_distance: 10.0                        # [m]
 
         # params for avoidance of vehicle type objects that are ambiguous as to whether they are parked.
-        force_avoidance:
+        avoidance_for_ambiguous_vehicle:
           enable: true                                   # [-]
           time_threshold: 3.0                            # [s]
           distance_threshold: 1.0                        # [m]