fix: only show execution panel if batch view supports it

e.g. POS batch view should not

src/wuttaweb/templates/batch/view.mako

@@ -7,6 +7,7 @@
 </%def>
 
 <%def name="tool_panel_execution()">
+  % if master.executable:
       <wutta-tool-panel heading="Execution">
         % if batch.executed:
             <b-notification :closable="false">
@@ -87,6 +88,7 @@
             % endif
         % endif
       </wutta-tool-panel>
+  % endif
 </%def>
 
 <%def name="modify_vue_vars()">