fix parsing of rating end points

The fake rating search end points need the Deserialize ActionClass to
parse their body.

Also, MetaCPAN::Client has a bug that prevents it from properly using
its testing user agent, so just give the results for normal MC::C UAs.

lib/MetaCPAN/Server/Controller/Rating.pm

@@ -28,17 +28,15 @@ sub _mapping : Path('_mapping') : Args(0) {
     $c->detach('/not_found');
 }
 
-sub find : Path('_search') : Args(0) {
+sub find : Path('_search') : Args(0) : ActionClass('~Deserialize') {
     my ( $self, $c, $scroll ) = @_;
 
     my @hits;
 
     # fake results for MetaCPAN::Client so it doesn't fail its tests
-    if ( ( $c->req->user_agent // '' )
-        =~ m{^MetaCPAN::Client-testing/([0-9.]+)} )
-    {
+    if ( ( $c->req->user_agent // '' ) =~ m{^MetaCPAN::Client/([0-9.]+)} ) {
         if ( $1 <= 2.031001 ) {
-            my $query = $c->read_param('query');
+            my $query = $c->params->{'query'};
             if (   $query
                 && $query->[0]
                 && $query->[0]{term}
@@ -72,7 +70,7 @@ sub find : Path('_search') : Args(0) {
     } );
 }
 
-sub all : Path('') : Args(0) {
+sub all : Path('') : Args(0) : ActionClass('~Deserialize') {
     my ( $self, $c ) = @_;
     $c->forward('find');
 }