encoding: remove unnecessary lambdas from _encodingfixers
They have been unnecessary since 1a3a08b5d4d5 (encoding: remove
workaround for locale.getpreferredencoding(), 2017-05-13). Also rename
the variable since "fixer" sounds like a function.
Differential Revision: https://phab.mercurial-scm.org/D4743
$ cat >> $HGRCPATH << EOF
> [ui]
> logtemplate="{rev}:{node|short} ({phase}) [{tags} {bookmarks}] {desc|firstline}\n"
> [extensions]
> dirstateparanoidcheck = $TESTDIR/../contrib/dirstatenonnormalcheck.py
> [experimental]
> nonnormalparanoidcheck = True
> [devel]
> all-warnings=True
> EOF
$ mkcommit() {
> echo "$1" > "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ hg init testrepo
$ cd testrepo
$ mkcommit a
$ mkcommit b
$ mkcommit c
$ hg status