nixos/wyoming/piper: enable streaming audio

With wyoming-piper 1.6.0 we can enable streaming audio on sentence
boundaries, which should improve the responsiveness.

nixos/modules/services/home-automation/wyoming/piper.nix

@@ -96,6 +96,10 @@ in
                 apply = toString;
               };
 
+              streaming = mkEnableOption "audio streaming on sentence boundaries" // {
+                default = true;
+              };
+
               extraArgs = mkOption {
                 type = listOf str;
                 default = [ ];
@@ -158,6 +162,9 @@ in
                 "--noise-w"
                 options.noiseWidth
               ]
+              ++ lib.optionals options.streaming [
+                "--streaming"
+              ]
               ++ options.extraArgs
             );
             CapabilityBoundingSet = "";