[RPP] Fix Connection Annotation not following the mouse when it's being created

Bug: None
Change-Id: I35fc4f79d4ae6382afc54ba011f4c17dc6815bd6
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6429730
Commit-Queue: Alina Varkki <[email protected]>
Commit-Queue: Jack Franklin <[email protected]>
Auto-Submit: Alina Varkki <[email protected]>
Reviewed-by: Jack Franklin <[email protected]>

Author: AlinaVarkki

front_end/panels/timeline/overlays/OverlaysImpl.ts

@@ -1174,7 +1174,8 @@ export class Overlays extends EventTarget {
           }
         }
 
-      } else if (this.#lastMouseOffsetX && this.#lastMouseOffsetY) {
+      } else {
+        // If the 'to' entry does not exist, the link is being created.
         // The second coordinate for in progress link gets updated on mousemove
         this.#entriesLinkInProgress = overlay;
       }