refactor(tts): remove redundant 4-space codeblock filter (#5406) * refactor(tts): remove redundant 4-space codeblock filter - Deleted the regex that removed lines starting with four spaces. - Original intent was to strip "indented code blocks" (Markdown legacy syntax). - In practice, SillyTavern already handles explicit code fences (```...``` and ~~~...~~~). - Indented code blocks are rarely used and the regex caused unnecessary text loss in normal messages. - Simplifies codeblock skipping logic and avoids accidental removal of valid content. * Remove commented out code --------- Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>