Removes stuttering from lizard hissing

Half-fixes https://github.com/tgstation/-tg-station/issues/5866

Lizard hissing will now "look like thisss inssstead of that ssstutterwhore crap" so lizards don't look permadrunk/tased.

There's no real way to fix the issue entirely, as far as checking for capitalization, without converting the speech filter to a new system, as far as I know.