Curly and double underline in terminal is cut off when using canvas renderer

[Tyriar]

Repro:

1. On Linux or macOS (Windows -> WSL won't work)
2. Set "terminal.integrated.gpuAcceleration": "canvas"
3. Run in the terminal: echo -e '\x1b[4:3mcurly\x1b[4:2mdouble\x1b[4:0m'

Expected:

Actual:

Upstream: xtermjs/xterm.js#4653, xtermjs/xterm.js#4664