Add support of screen-* $TERM in screen plugin

plugins/screen/screen.plugin.zsh

 # if using GNU screen, let the zsh tell screen what the title and hardstatus
 # of the tab window should be.
-if [[ $TERM == "screen" ]]; then
+if [[ "$TERM" == screen* ]]; then
   if [[ $_GET_PATH == '' ]]; then
     _GET_PATH='echo $PWD | sed "s/^\/Users\//~/;s/^\/home\//~/;s/^~$USER/~/"'
   fi