rugnux: correct the stale adaptive-spots default comment

The declaration still said "stills on, rotation off". Adaptive detection
has since been turned on for both workflows - adaptive_spots.value_or(true)
- which the comment at the assignment already explains.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

rugnux/rugnux_cli.cpp

@@ -526,7 +526,7 @@ static int RunRugnux(int argc, char **argv) {
     float sigma_spot_finding = 3.0;
     int64_t photon_count_threshold_spot_finding = 10;
     std::optional<int64_t> min_pix_per_spot;   // unset -> adaptive per image; a value -> fixed min-pix
-    std::optional<bool> adaptive_spots;   // unset -> per-workflow default (stills on, rotation off)
+    std::optional<bool> adaptive_spots;   // unset -> on, for both workflows
     float false_pixels_per_frame = 100.0f;
     std::string ref_mtz;
     std::string ref_column;