Fix off by one in Lua scripts

Lua arrays (tables) start counting at one.
Also `for i = a, b do .. end` is inclusive: a <= i <= b

share/scripts/__readable.lua

@@ -29,7 +29,7 @@ function factory () return function ()
 			-- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
 			local d = cmem:to_float (0):array()
 			-- iterate over the audio sample data
-			for i = 0, s do
+			for i = 1, s do
 				if math.abs (d[i]) > peak then
 					peak = math.abs (d[i])
 				end