Whitelist closure related cases to address the remaining no-shadow linting errors

Given the way that "classes" were previously implemented in PDF.js, using regular functions and closures, there's a fair number of false positives when the `no-shadow` ESLint rule was enabled.

Note that while *some* of these `eslint-disable` statements can be removed if/when the relevant code is converted to proper `class`es, we'll probably never be able to get rid of all of them given our naming/coding conventions (however I don't really see this being a problem).

src/core/image.js

@@ -96,6 +96,7 @@ var PDFImage = (function PDFImageClosure() {
     return dest;
   }
 
+  // eslint-disable-next-line no-shadow
   function PDFImage({
     xref,
     res,