[ZSH] More ARM fixes

zsh/.virtual_env_config.zsh_mac.example

@@ -1,4 +1,11 @@
+ARCH=`uname -m`
+if [[ $ARCH == "arm64" ]]; then
+    PREFIX="/opt/homebrew"
+else
+    PREFIX="/usr/local"
+fi
+
 export WORKON_HOME=~/python-envs
-export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
+export VIRTUALENVWRAPPER_VIRTUALENV=$PREFIX/bin/virtualenv
 mkdir -p $WORKON_HOME
-source /opt/homebrew/bin/virtualenvwrapper.sh
+source $PREFIX/bin/virtualenvwrapper.sh