module: fix inconsistency between load and _findPath

Files with multiple extensions are not handled by require-module system
therefore if you have file 'file.foo.bar' and require('./file') it won't
be found even while using require.extensions['foo.bar'] but before this
commit if you have require.extensions['foo.bar'] and
require.extensions['bar'] set then the latter will be called if you do
require('./file') but if you remove the former the former ('foo.bar')
property it will fail.
This commit makes it always fail in such cases.

Fixes: https://github.com/nodejs/node/issues/4778

PR-URL: https://github.com/nodejs/node/pull/22382


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>