fix(_comp_delimited): prepend prefix to all compreply args

Fixes #552.

Previously prefix was only prepended if COMPREPLY only contained one
argument - this commit fixes it so prefix is prepended to all arguments.

bash_completion

@@ -833,7 +833,8 @@ _comp_delimited()
         COMPREPLY=($(compgen "$@" -- "${cur##*"$delimiter"}"))
     fi
 
-    ((${#COMPREPLY[@]} == 1)) && COMPREPLY=(${COMPREPLY/#/$prefix})
+    COMPREPLY=("${COMPREPLY[@]/#/"$prefix"}")
+
     [[ $delimiter != : ]] || __ltrim_colon_completions "$cur"
 }