sys: match Novell default login drive mappings

Update the default net$log.dat template to use the same basic drive
layout as a standard Novell login script.

The default login now maps:

  F:  -> SYS:SYSTEM
  S1: -> SYS:PUBLIC
  S2: -> SYS:

This keeps the visible login result closer to Novell NetWare while
leaving the surrounding sample/login text intact.

README.md

@@ -139,7 +139,8 @@ and replace the default login script with something more useful, for example:
 
 ```txt
 MAP INS S1:=SYS:PUBLIC
-MAP *1:=SYS:
+MAP INS S2:=SYS:
+MAP *1:=SYS:SYSTEM
 ```
 
 ## Running

sys/net$log.dat.cmake

@@ -11,12 +11,21 @@ WRITE
 ; A new setup normally only has the SYS: volume, so this script does not
 ; reference APPS:, HOME:, CD-ROM volumes, or other file servers.
 ;
+; Match the classic NetWare default mapping layout:
+;   Drive F: = SERVER\SYS:\SYSTEM
+;   S1/Z:    = SERVER\SYS:\PUBLIC
+;   S2/Y:    = SERVER\SYS:\
+;
 ; Search drive for NetWare/MARS NWE utilities:
 MAP INS S1:=SYS:PUBLIC
 
-; First regular drive mapped to SYS: so command line tools have a stable
-; drive letter even on a one-volume installation.
-MAP *1:=SYS:
+; Search drive for the SYS: root.  This keeps SYS:\ on the search path like
+; the standard Novell login script does.
+MAP INS S2:=SYS:
+
+; First regular drive mapped to SYS:\SYSTEM, matching the standard Novell
+; login script layout shown by MAP after login.
+MAP *1:=SYS:SYSTEM
 
 ; Examples for local customisation.  Enable only after creating the
 ; corresponding directories or volumes.