fix(libs): pick up coa-ace3 9583952 (AceDB falsy-defaults PR #10 backport)

Re-sync after coa-ace3 9583952 backported WoWUIDev/Ace3 PR #10 which fixes
the AceDB-3.0 simple-value defaults metatable: previously falsy defaults
like ["*"] = false read back as nil because of `k2~=nil and v or nil`
short-circuiting. Now they round-trip correctly.

Libs/AceDB-3.0/AceDB-3.0.lua

@@ -111,7 +111,15 @@ local function copyDefaults(dest, src)
 				end
 			else
 				-- Values are not tables, so this is just a simple return
-				local mt = {__index = function(t,k2) return k2~=nil and v or nil end}
+				-- (PR #10 backport: the old `k2~=nil and v or nil` short-circuits to
+				-- nil whenever the default `v` itself is falsy — so `["*"] = false`
+				-- defaults silently became nil. Make the read explicit instead.)
+				local mt = {
+					__index = function(t,k2)
+							if k2 == nil then return nil end
+							return v
+						end,
+				}
 				setmetatable(dest, mt)
 			end
 		elseif type(v) == "table" then