Fix error message for named route matching

[berarma]

When a named route doesn't match, the error message contains "%s" instead of the named route. That's my guess.

[ADmad]

Fix looks good. Can you please also add a test case for it.

[cleptric]

\Cake\Core\Exception\Exception does a vsprintf if message is passed as array.

        throw new \Cake\Routing\Exception\MissingRouteException([
            'url' => 'Foo',
            'context' => 'Context',
            'message' => 'A named route was found for "%s", but matching failed.',
        ]);

[codecov-io]

Codecov Report

Merging #10589 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master   #10589      +/-   ##
============================================
- Coverage     94.89%   94.88%   -0.01%     
  Complexity    12101    12101              
============================================
  Files           422      422              
  Lines         30072    30072              
============================================
- Hits          28536    28533       -3     
- Misses         1536     1539       +3

Impacted Files	Coverage Δ	Complexity Δ
src/Routing/RouteCollection.php	100% <100%> (ø)	25 <0> (ø)	⬇️
src/Cache/CacheRegistry.php	95.83% <0%> (-4.17%)	11% <0%> (ø)
src/Cache/Engine/FileEngine.php	85.47% <0%> (-1.12%)	72% <0%> (ø)

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[berarma]

Alright @cleptric. It was because of an error in my app that it didn't work like it should. My ErrorController class wasn't properly extending the Cake's class. Sorry for my mistake.