tty PICK_NONE menus

When testing the menu/incomplete map situation I noticed that <return>
didn't work to dismiss the "list autopickup exceptions" menu.  <space>
or <escape> was required.  That was clearly intentional but doesn't
seem reasonable.  Make <return> behave the same for PICK_NONE as it
does for other menu modes in tty and as it does for other interfaces.

doc/fixes3-7-0.txt

@@ -1214,6 +1214,8 @@ tty: '$' can now select gold in a menu even when it isn't on current page
 tty: if a menu used full screen and brought up another menu that wasn't full
 	screen, sometimes only a small border of background was drawn around
 	it with most of the map left blank until after the menu was dismissed
+tty: have <return> dismiss pick-none menus instead of acting like '>' (not
+	only wouldn't dismiss when not on last page, wouldn't dismiss at all)
 Unix: when user name is used as default character name, keep hyphenated value
 	intact instead stripping off dash and whatever follows as if that
 	specified role/race/&c (worked once upon a time; broken since 3.3.0)

win/tty/wintty.c

@@ -2103,12 +2103,8 @@ process_menu_window(winid window, struct WinDesc *cw)
         case '\0': /* finished (commit) */
         case '\n':
         case '\r':
-            /* only finished if we are actually picking something */
-            if (cw->how != PICK_NONE) {
-                finished = TRUE;
-                break;
-            }
-        /* else fall through */
+            finished = TRUE;
+            break;
         case ' ':
         case MENU_NEXT_PAGE:
             if (cw->npages > 0 && curr_page != cw->npages - 1) {