[FIX] im_livechat: livechat button not rely on JS services

Revision of https://github.com/odoo/odoo/commit/02ec09cb1c3e2d7bc7968f40c18f2208d7f3f498

One of the purposes of the previous commit was to test discuss.
There was an attempt to test im_livechat, but it has been aborted due to the possibility
to use livechat on an external website.

However, some bits remain from this attempt, such as LivechatButton becoming a JS service
provider in order to use those services with the external lib. LivechatButton was not working
for the following reasons:

    - ServiceProviderMixin.init was not called (so it couldn't load any service);
    - On website, there are two service providers (LivechatButton & websiteRootInstance).

This fix ensures that LivechatButton does not rely on JS services, such as the bus_service.

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