Remove unnecessary IIFEs when setting the compatParams

This really isn't necessary, and it's just a left-over from before the code was moved into the current file.

Also, spotted during rebasing, use the existing "locale" hash-parameter in integration-tests rather than adding a duplicate one for testing.

test/integration/comment_spec.mjs

@@ -111,7 +111,7 @@ describe("Comment", () => {
         ".annotationEditorLayer",
         "page-width",
         null,
-        { enableComment: true, localeProperties: "ar" }
+        { enableComment: true, locale: "ar" }
       );
     });
 

web/app.js

@@ -387,7 +387,6 @@ const PDFViewerApplication = {
         forcePageColors: x => x === "true",
         pageColorsBackground: x => x,
         pageColorsForeground: x => x,
-        localeProperties: x => ({ lang: x }),
         sidebarViewOnLoad: x => parseInt(x),
       });
     }

web/app_options.js

@@ -37,19 +37,15 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
 
   // Limit canvas size to 5 mega-pixels on mobile.
   // Support: Android, iOS
-  (function () {
-    if (isIOS || isAndroid) {
-      compatParams.set("maxCanvasPixels", 5242880);
-    }
-  })();
+  if (isIOS || isAndroid) {
+    compatParams.set("maxCanvasPixels", 5242880);
+  }
 
   // Don't use system fonts on Android (issue 18210).
   // Support: Android
-  (function () {
-    if (isAndroid) {
-      compatParams.set("useSystemFonts", false);
-    }
-  })();
+  if (isAndroid) {
+    compatParams.set("useSystemFonts", false);
+  }
 }
 
 const OptionKind = {