Move the debuggerSrc-parameter into the AppOptions

Having this parameter among a list of DOM-elements seems slightly strange now, however this is very old code hence the explanation for why this was done is for historical reasons (as is often the case).
Hence we can simply move this into `AppOptions` instead, which seems more appropriate overall.

web/app.js

@@ -2167,11 +2167,10 @@ async function loadFakeWorker() {
 }
 
 async function loadPDFBug(self) {
-  const { debuggerScriptPath } = self.appConfig;
   const { PDFBug } =
     typeof PDFJSDev === "undefined"
-      ? await import(debuggerScriptPath) // eslint-disable-line no-unsanitized/method
+      ? await import(AppOptions.get("debuggerSrc")) // eslint-disable-line no-unsanitized/method
-      : await __non_webpack_import__(debuggerScriptPath);
+      : await __non_webpack_import__(AppOptions.get("debuggerSrc"));
 
   self._PDFBug = PDFBug;
 }

web/app_options.js

@@ -105,6 +105,11 @@ const defaultOptions = {
     value: 0,
     kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
   },
+  debuggerSrc: {
+    /** @type {string} */
+    value: "./debugger.mjs",
+    kind: OptionKind.VIEWER,
+  },
   defaultZoomDelay: {
     /** @type {number} */
     value: 400,

web/viewer.js

@@ -177,7 +177,6 @@ function getViewerConfiguration() {
       ),
     },
     printContainer: document.getElementById("printContainer"),
-    debuggerScriptPath: "./debugger.mjs",
   };
 }