update config file on tight floor paln

Author: zhaisitong

vtr_flow/tasks/regression_tests/vtr_reg_strong/strong_tight_floorplan/config/config.txt

@@ -25,4 +25,4 @@ pass_requirements_file=pass_requirements.txt
 
 # Script parameters
 script_params_common =-starting_stage vpr --route_chan_width 300 --max_router_iterations 400 --router_lookahead map --initial_pres_fac 1.0 --router_profiler_astar_fac 1.5 --seed 3
-script_params_list_add = -read_vpr_constraints tasks/regression_tests/vtr_reg_strong/strong_tight_floorplan/sixteenth.xml
+script_params_list_add = -read_vpr_constraints tasks/regression_tests/vtr_reg_strong/strong_tight_floorplan/bigkey_tight.xml