Fix t.audio.mixwithsystem defaults to false when absent from conf.lua

--HG--
branch : androidmic

src/scripts/boot.lua

@@ -471,7 +471,9 @@ function love.init()
 	end
 
 	if love._setAudioMixWithSystem then
-		love._setAudioMixWithSystem(c.audio and c.audio.mixwithsystem)
+		if c.audio and c.audio.mixwithsystem ~= nil then
+			love._setAudioMixWithSystem(c.audio.mixwithsystem)
+		end
 	end
 
 	if love._requestRecordingPermission then

src/scripts/boot.lua.h

@@ -948,10 +948,13 @@ const unsigned char boot_lua[] =
 	0x0a,
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