For #8017: remove redundant string per localization team (#9068)

Based on conversation in mozilla-mobile/fenix#8953 (comment)
X-Channel-Revision: [master] mozilla-mobile/android-components@8f1fe43
X-Channel-Converted-Revision: [master] mozilla-mobile/fenix@8663c47
X-Channel-Revision: [master] mozilla-mobile/firefox-tv@e8ccd59
X-Channel-Revision: [master] MozillaReality/FirefoxReality@0f9e435
X-Channel-Revision: [master] mozilla-lockwise/lockwise-android@ade612d

_meta/mozilla-mobile-fenix.json

@@ -1,6 +1,6 @@
 {
   "name": "mozilla-mobile/fenix",
   "revs": {
-    "master": "93cb3c205333989871aadd3aad344146c96acac2"
+    "master": "8663c479dcf6e2f0f506364b53ee67eee814fb85"
   }
 }

mozilla-mobile/fenix/app/src/main/res/values/strings.xml

@@ -600,10 +600,8 @@
     <string name="preference_option_autoplay_allowed">Video and audio allowed</string>
     <!-- Label that indicates that all video and audio autoplay is allowed -->
     <string name="preference_option_autoplay_allowed2">Allow audio and video</string>
-    <!-- DEPRECATED: Label that indicates that video and audio autoplay is only allowed over WIFI -->
-    <string name="preference_option_autoplay_allowed_wifi_only">Allow audio and video on WIFI only</string>
     <!-- Label that indicates that video and audio autoplay is only allowed over WIFI -->
-    <string name="preference_option_autoplay_allowed_wifi_only2">Allow audio and video on Wi-Fi only</string>
+    <string name="preference_option_autoplay_allowed_wifi_only">Allow audio and video on Wi-Fi only</string>
     <!-- Label that indicates that video autoplay is allowed, but audio autoplay is blocked -->
     <string name="preference_option_autoplay_block_audio">Block audio</string>
     <!-- Label that indicates that all video and audio autoplay is blocked -->