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).

web/debugger.js

@@ -285,6 +285,7 @@ var Stepper = (function StepperClosure() {
     return simpleObj;
   }
 
+  // eslint-disable-next-line no-shadow
   function Stepper(panel, pageIndex, initialBreakPoints) {
     this.panel = panel;
     this.breakPoint = 0;