Bind more unbound keys in viins and vicmd to nothing

Unbound keys in viins or vicmd mode have undefined results. Bind
two more of these to nothing to avoid this.

modules/editor/init.zsh

@@ -28,9 +28,11 @@ WORDCHARS='*?_-.[]~&;!#$%^(){}<>'
 zmodload zsh/terminfo
 typeset -gA key_info
 key_info=(
-  'Control'      '\C-'
-  'ControlLeft'  '\e[1;5D \e[5D \e\e[D \eOd'
-  'ControlRight' '\e[1;5C \e[5C \e\e[C \eOc'
+  'Control'         '\C-'
+  'ControlLeft'     '\e[1;5D \e[5D \e\e[D \eOd'
+  'ControlRight'    '\e[1;5C \e[5C \e\e[C \eOc'
+  'ControlPageUp'   '\e[5;5~'
+  'ControlPageDown' '\e[6;5~'
   'Escape'       '\e'
   'Meta'         '\M-'
   'Backspace'    "^?"
@@ -305,6 +307,8 @@ unbound_keys=(
   "${key_info[F12]}"
   "${key_info[PageUp]}"
   "${key_info[PageDown]}"
+  "${key_info[ControlPageUp]}"
+  "${key_info[ControlPageDown]}"
 )
 for keymap in $unbound_keys; do
   bindkey -M viins "${keymap}" _prezto-zle-noop