Fix blink_fast reset code

[kojix2]

Hi

The reset code for blink_fast was 26, but it should be 25.
25 turns off both blink 5 and blink_fast 6.
26 is unused and has no effect.

Ref https://en.wikipedia.org/wiki/ANSI_escape_code

Code for reproducing the issue:

require "colorize"

MOTEL = "MOTEL".colorize.red.blink_fast.bold.to_s 
VACANCY = "VACANCY".colorize.yellow.blink.bold.to_s 

puts "=============".colorize.light_blue
puts "||  " + MOTEL + "  ||"
puts "|| " + VACANCY + " ||"
puts "=============".colorize.light_blue