Examples: Clean up (#29209)

* Fix incorrect args

* E2E: Update screenshot.

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Co-authored-by: Mugen87 <michael.herzog@human-interactive.org>

examples/webgl_postprocessing_advanced.html

@@ -153,8 +153,8 @@
 
 				effectSepia.uniforms[ 'amount' ].value = 0.9;
 
-				effectVignette.uniforms[ 'offset' ].value = 0.95;
-				effectVignette.uniforms[ 'darkness' ].value = 1.6;
+				effectVignette.uniforms[ 'offset' ].value = 1.6;
+				effectVignette.uniforms[ 'darkness' ].value = 0.95;
 
 				const effectBloom = new BloomPass( 0.5 );
 				const effectFilm = new FilmPass( 0.35 );