RAMDRV: Place new unit number last in DEVLST

ProDOS prefers disks sorted with the fastest (e.g. ramdisks) at the
end and slowest (e.g. 5.25 floppies) at the start. This facilitates
pathname resolution starting at the end of DEVLST, so misses are
cheap.

ram.drv/ram.drv.system.s

@@ -341,13 +341,10 @@ copy_driver:
         dey
         bpl     :-
 
-        ;; Shift devices up by one
+        ;; Otherwise, insert at end. ProDOS resolves names to devices
+        ;; from last to first, so fast RAM disks should go last.
         inc     DEVCNT
         ldy     DEVCNT
-:       lda     DEVLST-1,y
-        sta     DEVLST,y
-        dey
-        bne     :-
 
         ;; Install device in ProDOS via DEVLST/DEVADR.
         ;; (Y has index in DEVLST)