3.x: fix basepath in redirecthandler

[LordSimal]

The current tests for 3.x fail due to the fact that the basepath is not handled correctly.

1) Authorization\Test\TestCase\Middleware\UnauthorizedHandler\CakeRedirectHandlerTest::testHandleRedirectWithBasePath
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'/basedir/login?redirect=%2Fadmin%2Fdashboard'
+'/login?redirect=%2Fadmin%2Fdashboard'

[ndm2]

Shouldn't Router::url() here handle the base path? The test might just need to use Router::setRequest()?

[ADmad]

I did a 2.x => 3.x merge and fixed this with other issues. Using Router::setRequest() is the proper way to fix it.