config: load reserve-device only if alsa.reserve is true

and also make the default of alsa.reserve to be false, for easier scripting

src/config/config.lua

@@ -83,9 +83,6 @@ function enable_audio()
 
   -- Implements storing metadata about objects in RAM
   load_module("metadata")
-
-  -- Enables device reservation via org.freedesktop.ReserveDevice1 on D-Bus
-  load_module("reserve-device")
 end
 
 function enable_endpoints()

src/config/config.lua.d/30-alsa-monitor.lua

@@ -7,8 +7,8 @@ local properties = {
   -- connect to the real JACK server.
   --["alsa.jack-device"] = false,
 
-  -- Reserve devices.
-  --["alsa.reserve"] = true,
+  -- Reserve devices via org.freedesktop.ReserveDevice1 on D-Bus
+  ["alsa.reserve"] = true,
   --["alsa.reserve.priority"] = -20,
   --["alsa.reserve.application-name"] = "WirePlumber",
 }
@@ -97,6 +97,11 @@ local rules = {
 }
 
 function enable_alsa()
+  -- The "reserve-device" module needs to be loaded for reservation to work
+  if properties["alsa.reserve"] then
+    load_module("reserve-device")
+  end
+
   load_monitor("alsa", {
     properties = properties,
     rules = rules,

src/scripts/monitors/monitor-alsa.lua

@@ -303,9 +303,8 @@ if config.properties["alsa.jack-device"] then
   })
 end
 
--- reservation is only disabled by explicitly setting it to false
-if config.properties["alsa.reserve"] == true or
-   config.properties["alsa.reserve"] == nil then
+-- enable device reservation if requested
+if config.properties["alsa.reserve"] then
   rd_plugin = Plugin("reserve-device")
 end