Problem:  In XTerm, typing Home, End, PgUp or PgDn on the editing pad
	  will cause vim to recognize <kHome>, <kEnd>, <kPageUp> or
	  <kPageDown> (keypad keys) instead of <Home>, <End>, <PageUp>
	  or <PageDown> (editing pad keys) respectively, affecting
	  `:map`pings and `:terminal`.
Cause:    The keypad termcaps are sorted before the editing pad ones in
	  termcodes, meaning vim will match the former if they are the
	  same.
Solution: Only recognize keypad keys when nothing else matches.

fixes: vim#17331

Signed-off-by: AstroSnail <astrosnail@protonmail.com>