Remove debugging code

lua/lazyvar.lua

@@ -9,7 +9,7 @@ local setmetatable = setmetatable
 
 -- Set this true to get tracebacks in error messages. It slows down lazyvars a lot,
 -- so don't use except when debugging.
-local ExtendedErrorMessages = true
+local ExtendedErrorMessages = false
 local EvalContext = nil
 local WeakKeyMeta = { __mode = 'k' }