python: Remove pyenv init woraround for pyenv >= 2.3.0

The startup logic and instructions have been updated for simplicity in
pyenv 2.3.0. The workaround for pyenv init is no longer necessary.

Signed-off-by: Indrajit Raychaudhuri <irc@indrajit.com>

modules/python/init.zsh

@@ -25,12 +25,7 @@ if [[ -s "${local_pyenv::=${PYENV_ROOT:-$HOME/.pyenv}/bin/pyenv}" ]] \
   # Ensure manually installed pyenv is added to path when present.
   [[ -s $local_pyenv ]] && path=($local_pyenv:h $path)
 
-  # pyenv 2+ requires shims to be added to path before being initialized.
-  autoload -Uz is-at-least
-  if is-at-least 2 ${"$(pyenv --version 2>&1)"[(w)2]}; then
-    eval "$(pyenv init --path zsh)"
-  fi
-
+  # Load pyenv into the shell session.
   eval "$(pyenv init - zsh)"
 
 # Prepend PEP 370 per user site packages directory, which defaults to