wd: point to the correct directory even if installed with antibody (#8116)

plugins/wd/wd.plugin.zsh

-#!/bin/zsh
-
 # WARP DIRECTORY
 # ==============
 # oh-my-zsh plugin
 #
 # @github.com/mfaerevaag/wd
 
-wd() {
-    . $ZSH/plugins/wd/wd.sh
-}
+eval "wd() { source '${0:A:h}/wd.sh' }"