EXRLoader: Remove buggy getBigInt64() fallback. (#33387)

Author: Mugen87

examples/jsm/loaders/EXRLoader.js

@@ -2082,17 +2082,7 @@ class EXRLoader extends DataTextureLoader {
 
 		const parseInt64 = function ( dataView, offset ) {
 
-			let int;
-
-			if ( 'getBigInt64' in DataView.prototype ) {
-
-				int = Number( dataView.getBigInt64( offset.value, true ) );
-
-			} else {
-
-				int = dataView.getUint32( offset.value + 4, true ) + Number( dataView.getUint32( offset.value, true ) << 32 );
-
-			}
+			const int = Number( dataView.getBigInt64( offset.value, true ) );
 
 			offset.value += ULONG_SIZE;