ao_audiotrack: enable pcm-float by default

Since recent commits this should work 100% as well as s16.

DOCS/interface-changes.rst

@@ -33,6 +33,7 @@ Interface changes
     - change `--subs-fallback` default from `no` to `default`
     - add the `--hdr-peak-percentile` option
     - include `--hdr-peak-percentile` in the `gpu-hq` profile
+    - change `--audiotrack-pcm-float` default from `no` to `yes`
  --- mpv 0.36.0 ---
     - add `--target-contrast`
     - Target luminance value is now also applied when ICC profile is used.

audio/out/ao_audiotrack.c

@@ -841,6 +841,9 @@ const struct ao_driver audio_out_audiotrack = {
     .reset     = stop,
     .start     = start,
     .priv_size = sizeof(struct priv),
+    .priv_defaults = &(const OPT_BASE_STRUCT) {
+        .cfg_pcm_float = 1,
+    },
     .options   = (const struct m_option[]) {
         {"pcm-float", OPT_BOOL(cfg_pcm_float)},
         {"session-id", OPT_INT(cfg_session_id)},