[style](trx-rs): cargo fmt

Apply rustfmt to the wefax and DIG-sideband changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UiK871ht2uPFBHtMbxy3wD
Signed-off-by: Stan Grams <sjg@haxx.space>

src/decoders/trx-wefax/src/tone_detect.rs

@@ -77,11 +77,11 @@ pub struct ToneDetector {
 
 impl ToneDetector {
     pub fn new(sample_rate: u32) -> Self {
-        let window_size = (sample_rate / 2) as usize; // ~0.5 s window
         // APT start/stop tones are transmitted for ~5 s (WMO), so requiring a
         // 2 s sustain costs no real detection latency while sharply cutting
         // false positives from busy image content that momentarily produces a
         // 300/450/675-transitions-per-second rate.
+        let window_size = (sample_rate / 2) as usize; // ~0.5 s window
         let min_sustain_s = 2.0;
         let window_duration_s = window_size as f32 / sample_rate as f32;
         let min_sustain_windows = (min_sustain_s / window_duration_s).ceil() as u32;