Prior to this commit, the `PathPatternRouteMatcher` would always use the
default path pattern separator when parsing incoming route strings to
`RouteMatcher.Route` instances.
When the `PathPatternRouteMatcher` is configured with a
`PathPatternParser` that has a custom separator (e.g., `.`), then the
matching algorithm can't match routes against parsed patterns.
This commit ensures that the route matcher uses the configured separator
at all times.
Fixes gh-23167
5787fc16fb