Improve "welcome1stboot" window

The first time that Puppy is booted, after the QuickSetup window comes the "welcome1stboot" window -- with the title "Welcome, woof, woof" -- also, Puppy barks twice.

the SD cards we are booting off now on the ARM boards, are full installations, no layered filesystem, and there is no need for selecting where to save the session at first shutdown.

So, I have modified the welcome window to omit the save-session section when not wanted.

Woof commit:
http://bkhome.org/fossil/woof2.cgi/info/449d8e6e1d

Tags: woof