wireplumber: Fix default volume of USB PnP microphone

Taken from upstream
https://gitlab.freedesktop.org/pipewire/wireplumber/-/blob/master/src/config/main.lua.d/40-stream-defaults.lua

wireplumber/.config/wireplumber/main.lua.d/60-mic-volume-default.lua

@@ -0,0 +1,34 @@
+stream_defaults         = {}
+stream_defaults.enabled = true
+
+stream_defaults.properties = {
+  ["restore-props"]          = true,
+  ["restore-target"]         = true,
+  ["default-channel-volume"] = 0.9,
+}
+
+stream_defaults.rules = {
+  {
+    matches = {
+      {
+        { "node.nick", "matches", "USB PnP Audio Device" },
+      },
+    },
+    apply_properties = {
+      ["state.restore-props"]          = false,
+      ["state.restore-target"]         = false,
+      ["state.default-channel-volume"] = 0.9,
+    },
+  },
+}
+
+function stream_defaults.enable()
+  if stream_defaults.enabled == false then
+    return
+  end
+
+  load_script("restore-stream.lua", {
+    properties = stream_defaults.properties,
+    rules = stream_defaults.rules,
+  })
+end