zsh: Make c-e always switch to editor

Added always listening to c-e to switch to edit current line in editor,
regardless of already being in vi-command mode or not.

zsh/.config/zsh/.zshrc

@@ -70,13 +70,13 @@ prompt pure
 # load additional aliases
 if [ -d "$CONFDIR/sh/alias.d" ]; then
     for _alias in "$CONFDIR/sh/alias.d"/*.sh; do
-        . "$_alias"
+        source "$_alias"
     done
     unset _alias
 fi
 if [ -d "$ZSHCONFDIR/alias.d" ]; then
     for _alias in "$ZSHCONFDIR/alias.d"/*.sh; do
-        . "$_alias"
+        source "$_alias"
     done
     unset _alias
 fi
@@ -171,6 +171,7 @@ bindkey -M isearch '^N' history-incremental-search-forward
 # Send command to editor and back for execution
 zle -N edit-command-line
 bindkey '^e' edit-command-line
+bindkey -M vicmd '^e' edit-command-line
 
 # Deduplicate PATH - remove any duplicate entries from PATH
 # from: https://unix.stackexchange.com/questions/40749/remove-duplicate-path-entries-with-awk-command