[NVIDIA-IMEX] Add default value for force_configuration

Author: Himani Anil Deshpande

cookbooks/aws-parallelcluster-platform/attributes/platform.rb

@@ -25,6 +25,7 @@
 
 # nvidia-imex
 default['cluster']['nvidia']['imex']['shared_dir'] = "#{node['cluster']['shared_dir']}/nvidia-imex"
+default['cluster']['nvidia']['imex']['force_configuration'] = false
 
 # DCV
 default['cluster']['dcv']['authenticator']['user'] = "dcvextauth"