Move the maybeValidDimensions check, used with JPEG images, to occur earlier (PR 11523 follow-up)

Given that the `NativeImageDecoder.{isSupported, isDecodable}` methods require both dictionary lookups *and* ColorSpace parsing, in hindsight it actually seems more reasonable to the `JpegStream.maybeValidDimensions` checks *first*.

src/core/image_utils.js

@@ -36,13 +36,13 @@ class NativeImageDecoder {
   canDecode(image) {
     return (
       image instanceof JpegStream &&
+      image.maybeValidDimensions &&
       NativeImageDecoder.isDecodable(
         image,
         this.xref,
         this.resources,
         this.pdfFunctionFactory
-      ) &&
-      image.maybeValidDimensions
+      )
     );
   }