Telemenu: Fix some bugs and add some improvements

Bugfixes
- a typo error induced by me, id instead of player
- The second teleportation way of this plugin can only be done when the menuactor is not alive.
There is no crouch in death mod or spectator mod, so i remove this useless call. (Line 134 - 139)
Improvements :
- Check mod VEC_DUCK_VIEW only one time.
- Removal of code duplication