adjust the button position in disassociate floating ip modal

[tinytmy]

In the disassociate floating ip modal, the cancel buttom and confirm buttom is dislocation.
Change it as other.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/181335

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/181335
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d99ac9bea8771e0bc3717b294046bd1b1a4cd893
Submitter: Jenkins
Branch: master

commit d99ac9bea8771e0bc3717b294046bd1b1a4cd893
Author: tinytmy <email address hidden>
Date: Fri May 8 05:12:59 2015 -0400

    Unified the position of modal's buttons

    In some only confirm modals, the 'cancel' button in the
    right, 'action' button in the left. However most of modals,
    the position of button is opposite. This patch unified
    the position of button.

    Change-Id: Ib0cf3f42581c1eda3a2213c612bb387c17cc567d
    Closes-bug:#1453048