Fix to handle parameters with Boolean values correctly

* Addresses the issue #10057

Signed-off-by: Hideki Saito <saito@fgrep.org>

awx_collection/plugins/modules/workflow_job_template.py

@@ -751,7 +751,7 @@ def main():
         'webhook_service',
     ):
         field_val = module.params.get(field_name)
-        if field_val:
+        if field_val is not None:
             new_fields[field_name] = field_val
 
     if 'extra_vars' in new_fields: