menu.conf: change duplicate hints

Deduplicate:
Op&en and &Editions/Titles
&Quit and &Quit watch later

etc/menu.conf

@@ -2,7 +2,7 @@ Pla&y	cycle pause		hidden=not pause and not idle_active	disabled=idle_active
 Pa&use	cycle pause		hidden=idle_active or pause
 &Stop	stop			hidden=idle ~= true						disabled=idle_active
 
-Op&en
+Ope&n
 	&Clipboard		loadfile ${clipboard/text}; show-text '+ ${clipboard/text}'
 	&History		script-binding select/select-watch-history
 	&Watch later	script-binding select/select-watch-later
@@ -140,4 +140,4 @@ T&ools
 	S&upport				script-binding select/open-chat
 
 &Quit				quit
-&Quit watch later	quit-watch-later	hidden=save_position_on_quit
+Quit watc&h later	quit-watch-later	hidden=save_position_on_quit