Make wish prompts not remember the input

With EDIT_GETLIN, the wish prompt remembered the previous input,
but this isn't actually useful.

doc/fixes36.2

@@ -95,6 +95,7 @@ object scattering during shop wall repair was skipped if a trap at the same
 	spot was also being removed
 augmented death reason for "while helpless" was broken for record and logfile
 	(but still correct for xlogfile)
+prevent wish prompt input from remembering the previous wish
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository

src/zap.c

@@ -5071,7 +5071,7 @@ int triesleft;
 void
 makewish()
 {
-    static char buf[BUFSZ] = DUMMY;
+    char buf[BUFSZ] = DUMMY;
     char promptbuf[BUFSZ];
     struct obj *otmp, nothing;
     int tries = 0;