Terraform: Allow lock flag to get set to false (#53873)

This change allows a false value to propagate appropriately to the terraform cli.

lib/ansible/modules/cloud/misc/terraform.py

@@ -337,7 +337,7 @@ def main():
         if module.params.get('lock'):
             command.append('-lock=true')
         else:
-            command.append('-lock=true')
+            command.append('-lock=false')
     if module.params.get('lock_timeout') is not None:
         command.append('-lock-timeout=%ds' % module.params.get('lock_timeout'))