Some escape sequences are not properly applied when a string is colorized

To reproduce:
```rb
require "colorize"
puts "test\r\e[Kx"
puts "test\r\e[Kx".red
```

Expected output:
```
x
x
```

Actual output:
```
x
[Kxt
```

This might be unfixable due to limitations of ANSI escape sequences; I have no idea.