[RPP] Fix enhanced traces function stacks not linking / using source map

Regressed in http://crrev.com/c/6940957. For some unknown reasons, the
search params are very important for this to work.

Bug: 427455148
Change-Id: I59c0d14d98c28b6bdc27bbba780dc25dcc05106d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7028256
Auto-Submit: Connor Clark <cjamcl@chromium.org>
Commit-Queue: Connor Clark <cjamcl@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>

Author: Connor Clark

front_end/panels/timeline/TimelinePanel.ts

@@ -1652,8 +1652,6 @@ export class TimelinePanel extends Common.ObjectWrapper.eventMixin<EventTypes, t
     const url = new URL(window.location.href);
     const pathToEntrypoint = url.pathname.slice(0, url.pathname.lastIndexOf('/'));
     url.pathname = `${pathToEntrypoint}/rehydrated_devtools_app.html`;
-    // The standalone devtools shouldn't retain any existing query params.
-    url.search = '';
     pathToLaunch = url.toString();
 
     // Clarifying the window the code is referring to