vpr: add gausian blur to check ci run-time limit

Author: amin1377

vtr_flow/tasks/regression_tests/vtr_reg_nightly_test7/titan_quick_qor_run_flat/config/config.txt

@@ -20,7 +20,7 @@ archs_dir=arch/titan
 #of the slowest benchmarks
 
 #Largest benchmarks, excluded
-#circuit_list_add=gaussianblur_stratixiv_arch_timing.blif
+circuit_list_add=gaussianblur_stratixiv_arch_timing.blif
 
 #Mixed order of large and small
 circuit_list_add=gsm_switch_stratixiv_arch_timing.blif