Fix mouseover bindings when used with Clique

diff --git a/PerfectRaid_Highlight.lua b/PerfectRaid_Highlight.lua
index 1f126fc..6f211f0 100644
--- a/PerfectRaid_Highlight.lua
+++ b/PerfectRaid_Highlight.lua
@@ -81,8 +81,11 @@ function Highlight:UpdateButtonLayout(button, options)
 	button:SetBackdrop(backdrop)
 	button:SetBackdropColor(0,0,0,0)

-	button:SetScript("OnEnter", OnEnter)
-	button:SetScript("OnLeave", OnLeave)
+    if not button.highlight_scripts_set then
+        button:HookScript("OnEnter", OnEnter)
+        button:HookScript("OnLeave", OnLeave)
+        button.highlight_scripts_set = true
+    end
 end

 -- Handle the buff events as they come across, and keep track of who has what buffs.