Fix cinematic camera example

[takahirox]

This PR fixes broken cinemaric camera example #13729

@Mugen87

Why DEPTH_PACKING comparison in fragment shader of BokehShader2 is not

#if DEPTH_PACKING == 3201

but

#if DEPTH_PACKING == 1

?

3201 is THREE.RGBADepthPacking.

[Mugen87]

It is just a true/false flag 😊

I've reused this pattern from other shaders for consistency reasons e.g.

three.js/examples/js/shaders/SAOShader.js

Lines 79 to 85 in 22dffb0

	"float getDepth( const in vec2 screenPosition ) {",
	" #if DEPTH_PACKING == 1",
	" return unpackRGBAToDepth( texture2D( tDepth, screenPosition ) );",
	" #else",
	" return texture2D( tDepth, screenPosition ).x;",
	" #endif",
	"}",

three.js/examples/js/postprocessing/SAOPass.js

Line 84 in 22dffb0

this.saoMaterial.defines[ 'DEPTH_PACKING' ] = this.supportsDepthTextureExtension ? 0 : 1;

[Mugen87]

The depth material of CinematicCamera also needs RGBADepthPacking.

https://github.com/takahirox/three.js/blob/f069efb0d79b7b9adadc30005d7c832543a68db5/examples/js/cameras/CinematicCamera.js#L20

this.material_depth = new THREE.MeshDepthMaterial();
this.material_depth.depthPacking = THREE.RGBADepthPacking;

[takahirox]

Thanks, I've updated.