Enabled BakedIndirect in the UI.

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

             SupportedRenderingFeatures.active = new SupportedRenderingFeatures()
             {
                 reflectionProbeSupportFlags = SupportedRenderingFeatures.ReflectionProbeSupportFlags.None,
-                defaultMixedLightingMode = SupportedRenderingFeatures.LightmapMixedBakeMode.Subtractive,
-                supportedMixedLightingModes = SupportedRenderingFeatures.LightmapMixedBakeMode.Subtractive,
+                defaultMixedLightingMode = SupportedRenderingFeatures.LightmapMixedBakeMode.IndirectOnly,
+                supportedMixedLightingModes = SupportedRenderingFeatures.LightmapMixedBakeMode.Subtractive | SupportedRenderingFeatures.LightmapMixedBakeMode.IndirectOnly,
                 supportedLightmapBakeTypes = LightmapBakeType.Baked | LightmapBakeType.Mixed,
                 supportedLightmapsModes = LightmapsMode.CombinedDirectional | LightmapsMode.NonDirectional,
                 rendererSupportsLightProbeProxyVolumes = false,