revert change to _not_ trim silence when azure ssml is used

lib/synth-audio.js

@@ -125,8 +125,7 @@ async function synthAudio(client, logger, stats, { account_sid,
   if (['nuance', 'nvidia'].includes(vendor) ||
     (
       process.env.JAMBONES_TTS_TRIM_SILENCE &&
-      ['microsoft', 'azure'].includes(vendor) &&
-      !text.startsWith('<speak')
+      ['microsoft', 'azure'].includes(vendor)
     )
   ) {
     filePath = `${TMP_FOLDER}/${key.replace('tts:', `tts-${salt || ''}`)}.r8`;