[4.3.4] Prevent seal of justice can be activated together with other seal

Currently, if you use seal of justice, you can activatee other seal without seal of Justice removed.

Seal of Justice http://www.wowhead.com/spell=20164

From spellwork

ID - 20164 Seal of Justice
Description: Fills the Paladin with the spirit of justice for $20164d, causing each single-target melee attack to limit the target's maximum run speed for $20170d and deal ${$MWS*(0.005*$AP+0.01*$SPH)*$<sop>/100} additional Holy damage.  Only one Seal can be active on the Paladin at any one time.

Unleashing this Seal's energy will deal ${1+0.25*$SPH+0.16*$AP} Holy damage to an enemy.
ToolTip: Melee attacks limit maximum run speed for $20170d and deal ${$MWS*(0.005*$AP+0.01*$SPH)*$<sop>/100} additional Holy damage.
Category = 0, SpellIconID = 307, activeIconID = 0, SpellVisual = (9504,0)
Family SPELLFAMILY_PALADIN, flag [0] 0x00000000 [1] 0x80000000 [2] 0x00000000