thirdparty: improve UnitXP skin

modules/thirdparty-vanilla.lua

@@ -1224,8 +1224,6 @@ pfUI:RegisterModule("thirdparty-vanilla", "vanilla", function()
   -- UnitXP SP3 compatibility
   -- https://github.com/allfoxwy/UnitXP_SP3
   HookAddonOrVariable("UnitXP_SP3_Addon", function()
-    -- skin main menu button
-    SkinButton(GameMenuButtonXPSP3)
     -- skin UnitXP SP3 window and elements
     StripTextures(xpsp3Frame)
     CreateBackdrop(xpsp3Frame)
@@ -1236,7 +1234,15 @@ pfUI:RegisterModule("thirdparty-vanilla", "vanilla", function()
     SkinCheckbox(xpsp3_checkButton_modernNameplate)
     SkinCheckbox(xpsp3_checkButton_notify_flashTaskbarIcon)
     SkinCheckbox(xpsp3_checkButton_notify_playSystemDefaultSound)
-    SkinButton(xpsp3_button_close)
+
+    local buttons = {
+      xpsp3_button_close,
+      xpsp3_button_cameraHeight_raise,
+      xpsp3_button_cameraHeight_lower,
+    }
+    for _, button in pairs(buttons) do
+      SkinButton(button)
+    end
   end)
 
 end)