fix: Reset audio bus layout (#542)

addons/escoria-core/default_bus_layout.tres

@@ -1,7 +1,6 @@
 [gd_resource type="AudioBusLayout" format=2]
 
 [resource]
-bus/0/volume_db = -8.89811
 bus/1/name = "SFX"
 bus/1/solo = false
 bus/1/mute = false
@@ -12,7 +11,7 @@ bus/2/name = "Music"
 bus/2/solo = false
 bus/2/mute = false
 bus/2/bypass_fx = false
-bus/2/volume_db = -60.0
+bus/2/volume_db = 0.0
 bus/2/send = "Master"
 bus/3/name = "Speech"
 bus/3/solo = false