Add alsa-config to fix "Audio cutting out when multiple streams start playing"

- https://wiki.archlinux.org/title/PipeWire#Audio_cutting_out_when_multiple_streams_start_playing

Configs/.config/wireplumber/wireplumber.conf.d/alsa-config.conf

@@ -0,0 +1,15 @@
+monitor.alsa.rules = [
+  {
+    matches = [
+      {
+        node.name = "~alsa_output.*"
+      }
+    ]
+    actions = {
+      update-props = {
+        api.alsa.period-size   = 1024
+        api.alsa.headroom      = 8192
+      }
+    }
+  }
+]