Fix toggler click event

On the master branch the .toggle div (https://github.com/EmmanuelVella/NelmioApiDocBundle/blob/master/Resources/views/method.html.twig#L2) has a data-href attribute since https://github.com/nelmio/NelmioApiDocBundle/commit/0a42d1773cbad7fffda9b07ef0714e1092fc6060#diff-d54056867729d3fa16536eed2bdd1715R2

BTW, why the 2.6.0 tag doesn't have this commit ?