fix(libs): restore ElvUI-namespaced Ace3 stack clobbered by sweep

The coa-ace3 sweep (commits 0c130e0..5ea6e44, before coa-elvui was added to
EXCLUDED_FORKS in coa-ace3 tools/sweep.py) overwrote ElvUI's customized,
-ElvUI-namespaced Ace3 libs with plain canonical ones. ElvUI registers libs
as AceLocale-3.0-ElvUI and the AceConfig-3.0-ElvUI family (plus -ElvUI
widgets that don't exist in canonical), so the clobber left them
unregistered: ElvUI failed to init (16 locale 'L' errors) and /ec would not
open. Restores ElvUI/Libraries/Ace3/AceLocale-3.0 and the
ElvUI_OptionsUI/Libraries/Ace3 stack to their pre-sweep state (5021fd1).
coa-elvui is now in EXCLUDED_FORKS, so this won't be re-clobbered.

ElvUI_OptionsUI/Libraries/Ace3/AceGUI-3.0/widgets/AceGUIWidget-Button.lua

@@ -2,7 +2,7 @@
 Button Widget
 Graphical Button.
 -------------------------------------------------------------------------------]]
-local Type, Version = "Button", 24
+local Type, Version = "Button", 23
 local AceGUI = LibStub and LibStub("AceGUI-3.0", true)
 if not AceGUI or (AceGUI:GetWidgetVersion(Type) or 0) >= Version then return end
 
@@ -18,7 +18,7 @@ Scripts
 -------------------------------------------------------------------------------]]
 local function Button_OnClick(frame, ...)
 	AceGUI:ClearFocus()
-	PlaySound(852) -- SOUNDKIT.IG_MAINMENU_OPTION
+	PlaySound("igMainMenuOption")
 	frame.obj:Fire("OnClick", ...)
 end
 
@@ -74,7 +74,7 @@ Constructor
 -------------------------------------------------------------------------------]]
 local function Constructor()
 	local name = "AceGUI30Button" .. AceGUI:GetNextWidgetNum(Type)
-	local frame = CreateFrame("Button", name, UIParent, "UIPanelButtonTemplate")
+	local frame = CreateFrame("Button", name, UIParent, "UIPanelButtonTemplate2")
 	frame:Hide()
 
 	frame:EnableMouse(true)