Dont allow navigation shortcuts in read aloud overlays

They are pointless as the selection is changed causing a scroll as words
are read

src/pyj/read_book/iframe.pyj

@@ -1004,8 +1004,6 @@ class IframeBoss:
             sel = window.getSelection()
             sel.removeAllRanges()
             self.send_message('tts', type='text-extracted', marked_text=marked_text, pos=data.pos)
-        elif data.type is 'trigger-shortcut':
-            self.on_handle_navigation_shortcut(data)
 
     def mark_word_being_spoken(self, occurrence_number):
         self.last_search_at = window.performance.now()
@@ -1034,8 +1032,6 @@ class IframeBoss:
             else:
                 par = smil_element_at(data.pos, self.smil_anchor_map, self.smil_par_list)
             self.send_message('audio_ebook_message', type='start_play_at', par=par or None, anchor=data.anchor or None)
-        elif data.type is 'trigger_shortcut':
-            self.on_handle_navigation_shortcut(data)
         else:
             console.error(f'Unknown audio ebook message type from main: {data.type}')
 

src/pyj/read_book/read_aloud.pyj

@@ -226,8 +226,6 @@ class ReadAloud:
         elif sc_name is 'quit':
             self.hide()
             ui_operations.quit()
-        elif sc_name in ('up', 'down', 'pageup', 'pagedown', 'left', 'right'):
-            self.send_message('trigger-shortcut', name=sc_name)
 
     def handle_tts_event(self, which, data):
         if which is 'mark':

src/pyj/read_book/read_audio_ebook.pyj

@@ -329,8 +329,6 @@ class ReadAudioEbook:
             self.hide()
         elif sc_name is "quit":
             self.hide()
-        elif sc_name in ("up", "down", "pageup", "pagedown", "left", "right"):
-            self.send_message("trigger_shortcut", name=sc_name)
 
     def send_message(self, message_type, **kw):
         self.view.iframe_wrapper.send_message("audio-ebook", type=message_type, **kw)