Revert SEARCHSIZE/LOOKAHEAD increase for now (re: af5ae2e)

This increase causes one of the pty.sh regression tests to fail on
a number of systems. The cause is under investigation. More at:
#864

Author: McDutchie

NEWS

@@ -8,11 +8,6 @@ Uppercase BUG_* IDs are shell bug IDs as used by the Modernish shell library.
   prompts use the kitty terminal's escape sequence (e.g. $'\E[4:4m'
   in the PS1 prompt for formatting spaced dots).
 
-2025-05-30:
-
-- The editor typeahead buffer and the limit for the ${.sh.edchar} variable
-  (used with the KEYBD trap) has been increased from 80 to 500 bytes.
-
 2025-05-29:
 
 - Fixed a serious but rarely occurring regression that corrupts variable

src/cmd/ksh93/include/edit.h

@@ -25,14 +25,14 @@
  *
  */
 
-#define SEARCHSIZE	500
+#define SEARCHSIZE	80
 
 #include	"FEATURE/cmds"
 #include        "FEATURE/locale"
 #include	"terminal.h"
 
 #define STRIP		0377
-#define LOOKAHEAD	500
+#define LOOKAHEAD	80
 
 #if SHOPT_MULTIBYTE
 #   include	"national.h"