fix(man,info): remove ineffective "_expand" calls

The function "_expand" processes "cur" that begins with a tilde, which
is actually already processed by earlier codes in these completions.
Thus "_expand" will never see "cur" starting with a tilde there.

The earlier codes processing the tilde were introduced in commit
1b85a1b.  The calls of "_expand" was moved after the code in commit
add4e3c, for which we forgot the background unfortunately.  We here
just remove the calls of "_expand".

Author: akinomyoga

completions/info

@@ -47,8 +47,6 @@ _info()
         infopath=$INFOPATH
     fi
 
-    _expand || return
-
     infopath=$infopath:
     if [[ -n $cur ]]; then
         infopath="${infopath//://$cur* }"

completions/man

@@ -75,8 +75,6 @@ _man()
     # shellcheck disable=SC2053
     [[ $prev == $mansect ]] && sect=$prev || sect='*'
 
-    _expand || return
-
     manpath=$manpath:
     if [[ -n $cur ]]; then
         manpath="${manpath//://*man$sect/$cur* } ${manpath//://*cat$sect/$cur* }"