PMREMNode: Clean up.

Author: Mugen87

src/nodes/pmrem/PMREMNode.js

@@ -5,7 +5,6 @@ import { uniform } from '../core/UniformNode.js';
 import { NodeUpdateType } from '../core/constants.js';
 import { nodeProxy, vec3 } from '../tsl/TSLBase.js';
 
-import { WebGLCoordinateSystem } from '../../constants.js';
 import { Texture } from '../../textures/Texture.js';
 import PMREMGenerator from '../../renderers/common/extras/PMREMGenerator.js';