pause_resume_cancel: Fix issue jschuh#28

Author: jschuh

pause_resume_cancel.cfg

@@ -45,6 +45,7 @@ description: Pauses the current print.
 gcode:
   PAUSE P=2{% for k in params|select("in", "BEXYZ") %}{
       ' '~k~'="'~params[k]~'"'}{% endfor %}
+  SET_GCODE_VARIABLE MACRO=_load_unload VARIABLE=is_printing VALUE="{0}"
   UNLOAD_FILAMENT{% if 'U' in params %} LENGTH={params.U}{% endif %}
   {% if 'R' in params %}M109 S{params.R}{% endif %}