RPP: prevent default click on dialog blurred background

This fixes a bug where the consent dialog gets closed by the user
clicking on the blurred background, but then the new RPP annotation
label goes away because the click also acts on whatever the user
happened to click. The background is blurred and therefore this
behaviour is unexpected.

Fixed: 406955544
Change-Id: I970ca220b37d6751fb73e20a91de527c3c32368c
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6439199
Auto-Submit: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Alina Varkki <alinavarkki@chromium.org>
Commit-Queue: Alina Varkki <alinavarkki@chromium.org>

Author: jackfranklin

front_end/panels/common/common.ts

@@ -114,7 +114,7 @@ export class FreDialog {
     // clang-format on
 
     dialog.setOutsideClickCallback(ev => {
-      ev.consume();
+      ev.consume(true);  // true = preventDefault()
       dialog.hide();
       result.resolve(false);
     });