Cleanup webgl_materials_modified (#26437)

* Cleanup webgl_materials_modified

* Formatting

Author: Methuselah96

examples/webgl_materials_modified.html

@@ -112,7 +112,7 @@
 
 				material.customProgramCacheKey = function () {
 
-					return amount;
+					return amount.toFixed( 1 );
 
 				};