And also simplify functions glob in init.zsh

to match the change done in `login_init.zsh`.

Also call autoloaded function only when autoload succeeded.

init.zsh

@@ -2,8 +2,7 @@
 # Zim initializition
 #
 
-autoload -Uz is-at-least
-if ! is-at-least 5.2; then
+autoload -Uz is-at-least && if ! is-at-least 5.2; then
   print "ERROR: Zim didn't start. You're using zsh version ${ZSH_VERSION}, and versions < 5.2 are not supported. Update your zsh." >&2
   return 1
 fi
@@ -22,7 +21,7 @@ fi
   # autoload searches fpath for function locations; add enabled module function paths
   fpath=(${ZIM_HOME}/modules/${^zmodules}/functions(/FN) ${fpath})
 
-  for mod_function in ${ZIM_HOME}/modules/${^zmodules}/functions/^([_.]*|prompt_*_setup|README*|*.zwc|*.zwc.old)(-.N:t); do
+  for mod_function in ${ZIM_HOME}/modules/${^zmodules}/functions/^(_*|prompt_*_setup|*.*)(-.N:t); do
     autoload -Uz ${mod_function}
   done
 }