Deleting the counterpart of the dict in the templates.

IPython/nbconvert/templates/reveal_internals/subslides.tpl

@@ -1,4 +1,4 b''
-{%- extends 'reveal_internals/align_reveal_cells.tpl' -%}
+{%- extends 'reveal_internals/reveal_cells.tpl' -%}
 
 
 {%- block any_cell scoped -%}