make npm run export-strings happier

make npm run export-strings happier

The UrlMatcher function used by the provider interface needs
to spelled slighly differently to avoid the AOT compiler
used by "npm run export-strings" from failing with the following error:

ERROR in Error during template compile of 'AcqProviderRoutingModule'
  Function expressions are not supported in decorators in 'ɵ0'
    'ɵ0' contains the error at app/staff/acq/provider/routing.module.ts(7,14)
      Consider changing the function expression into an exported function

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>