feat: simplify conditional for use_bespoke

Author: jackhodgkiss

roles/github/templates/workflow.yml.j2

@@ -9,7 +9,7 @@
   %%- formatted_name -%%
 <%- endmacro -%>
 
-<% if workflow.use_bespoke is defined and workflow.use_bespoke is true %>
+<% if workflow.use_bespoke is true %>
   <%- extends workflow.file_name + ".j2" | string +%>
 <% else %>
   <%- extends "generic.yml.j2" +%>