Fix curses cursor keys

My change to allow fuzzer run in curses caused the cursor keys
to not work (eg. paging through menus with left and right cursor),
so fix that.

win/curses/cursmisc.c

@@ -26,6 +26,18 @@ static int curs_y = -1;
 static int parse_escape_sequence(void);
 
 
+int
+curses_getch(void)
+{
+    int ch;
+
+    if (iflags.debug_fuzzer)
+        ch = randomkey();
+    else
+        ch = getch();
+    return ch;
+}
+
 /* Read a character of input from the user */
 
 int
@@ -39,10 +51,7 @@ curses_read_char(void)
     /* cancel message suppression; all messages have had a chance to be read */
     curses_got_input();
 
-    if (iflags.debug_fuzzer)
-        ch = randomkey();
-    else
-        ch = getch();
+    ch = curses_getch();
 #if defined(ALT_0) || defined(ALT_9) || defined(ALT_A) || defined(ALT_Z)
     tmpch = ch;
 #endif