Font size'd underlined space has 2 underline bars #8950

Describe the bug
Printing a space with font size > 1 and using underline style causes 2 lines to appear

To Reproduce
Steps to reproduce the behavior:

1. printf "\e[4m\e]66;s=2; \a\n\e[24m"
2. See 2 lines

Screenshots

Environment details
kitty 0.42.2, linux

Additional context
Reproduces with kitty --config NONE.