Fix disabling of bold and fastblink

Browse Source

According to ECMA-48¹ 8.3.117, an attribute value of 21 is "doubly
underlined", while 22 is "normal colour or normal intensity (neither
bold nor faint)".

Additionally, 25 is "steady (not blinking)", which likely means neither
slow blink nor fast blink.

¹: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-048.pdf

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>

...

This commit is contained in:

500 Internal Server Error

Gitea Version: 1.28.0+dev-505-g31b4d79a84