[FIX] class on login form when not logged in is login_invalid
[FIX] class on login form when not logged in is login_invalid

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extra : convert_revision : xmo%40openerp.com-20110317171855-rkxishrwei6st88u

vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,splbio/openerp-web,splbio/openerp-web,gisce/openerp-web