Correct the target output directory path to correspond with panels.

hardware/dscomm-panel.kicad_pcb

@@ -123,7 +123,7 @@
       (mirror false)
       (drillshape 0)
       (scaleselection 1)
-      (outputdirectory "fabsingle"))
+      (outputdirectory "fabpanel"))
   )
 
   (net 0 "")