Fix memory leak

Author: abeverley

lib/Dancer2/Core/App.pm

@@ -1213,7 +1213,7 @@ sub compile_hooks {
                     # Don't execute the hook_exception hook if the exception
                     # has been generated from a hook exception handler itself,
                     # thus preventing potentially recursive code.
-                    $self->execute_hook( 'core.app.hook_exception', $app, $err )
+                    $app->execute_hook( 'core.app.hook_exception', $app, $err )
                         unless $position eq 'core.app.hook_exception';
                     my $is_halted = $app->response->is_halted; # Capture before cleanup
                     # We can't cleanup if we're in the hook for a hook