Fix end time in substitutions print

aleksis/apps/chronos/templates/chronos/partials/subs/period.html

@@ -7,7 +7,7 @@
       {{ el.REFERENCE_OBJECT.slot_number_start }}.–{{ el.REFERENCE_OBJECT.slot_number_end }}.
     {% endif %}
   {% elif el.DTSTART.dt.time %}
-    {{ el.DTSTART.dt.time }}–{{ el.DTSTART.dt.time }}
+    {{ el.DTSTART.dt.time }}–{{ el.DTEND.dt.time }}
   {% else %}
     {% trans "all day" %}
   {% endif %}