Enable no-unsafe-negation lint

This actually fixes a bug--the old code was negating "audioData.type"

.eslintrc.js

@@ -65,7 +65,6 @@ module.exports = {
         'no-case-declarations': 'off',
         'use-isnan': 'off',
         'no-self-assign': 'off',
-        'no-unsafe-negation': 'off',
         'no-constant-condition': ['error', {checkLoops: false}]
     }
 };

public/scripts/extensions/tts/index.js

@@ -425,7 +425,7 @@ function completeCurrentAudioJob() {
  */
 async function addAudioJob(response) {
     const audioData = await response.blob()
-    if (!audioData.type in ['audio/mpeg', 'audio/wav', 'audio/x-wav', 'audio/wave', 'audio/webm']) {
+    if (!(audioData.type in ['audio/mpeg', 'audio/wav', 'audio/x-wav', 'audio/wave', 'audio/webm'])) {
         throw `TTS received HTTP response with invalid data format. Expecting audio/mpeg, got ${audioData.type}`
     }
     audioJobQueue.push(audioData)