Add --audio-encoder

Similar to --video-encoder, but for audio.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>

app/data/bash-completion/scrcpy

@@ -5,6 +5,7 @@ _scrcpy() {
         --audio-bit-rate=
         --audio-codec=
         --audio-codec-options=
+        --audio-encoder=
         -b --video-bit-rate=
         --crop=
         -d --select-usb

app/data/zsh-completion/_scrcpy

@@ -12,6 +12,7 @@ arguments=(
     '--audio-bit-rate=[Encode the audio at the given bit-rate]'
     '--audio-codec=[Select the audio codec]:codec:(opus aac)'
     '--audio-codec-options=[Set a list of comma-separated key\:type=value options for the device audio encoder]'
+    '--audio-encoder=[Use a specific MediaCodec audio encoder]'
     {-b,--video-bit-rate=}'[Encode the video at the given bit-rate]'
     '--crop=[\[width\:height\:x\:y\] Crop the device screen on the server]'
     {-d,--select-usb}'[Use USB device]'