util.datamanager: Fix listing of host stores lfs returns the basename of the directory entry, and the check neglected to prefix the data path directory before calling lfs.attribute(), which resulted in checking Prosody's current working directory for the file instead.

if not math.type then

	local function math_type(t)
		if type(t) == "number" then
			if t % 1 == 0 and t ~= t + 1 and t ~= t - 1 then
				return "integer"
			else
				return "float"
			end
		end
	end
	_G.math.type = math_type
end