rankings_alliance_vs_alliance.php: fix header highlight
rankings_alliance_vs_alliance.php: fix header highlight

Highlight the "Versus" subheading of "Alliance Rankings" when it is
clicked on. It was previously highlighting the "Death" subheading.

hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr