Competition Page Should Display Only The Group Where The Player Is Present

@anoek small but very useful optimization.

With this new huge competition I think that is useful that the competition page should display only the group where the player is present, and next to it a link named view all groups, link that goes to the actual page. This will save a lot of server load (and will save the planet:) And will save the user of a lot of scrolling, since obviously will want to look at his own group.

I am not sure if this is the place where I should present this suggestion, but if is not, this post can be deleted after is seen by the chief wizard.