Recorrect panelised format when plotting Gerber and Excellon archives.

hardware/dscomm-panel.kicad_pcb

@@ -130,7 +130,7 @@
       (mirror false)
       (drillshape 0)
       (scaleselection 1)
-      (outputdirectory "fabsingle"))
+      (outputdirectory "fabpanel"))
   )
 
   (net 0 "")