Recent TTYDEF_LFLAG default change

[Andrey Chernov]

TTYDEF_LFLAG have ECHO* in it for years, and it is user-visible, some 
programs may use it (see recent stty/key.c hacking).

Why it was needed to remove ECHO* from here just to make yet one 
non-standard, non cross-BSD compatible and unknown TTYDEF_LFLAG_ECHO?

The same goal can be reached by leaving TTYDEF_LFLAG as it always be (with 
echo), backing out stty/key.c hacking and and just opposite
TTYDEF_LFLAG_NOECHO.

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