[Passwords] Minor Leak Detection Proto Packet Fix

This change modifies the leak_detection_api.proto to have the same
package name as the server side definition.

Bug: 986298
Change-Id: I259b4c78c59dc9898a212a88f294e9b20414086a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732079
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683647}

components/password_manager/core/browser/leak_detection/leak_detection_api.proto

 syntax = "proto3";
 
-package leak_detection;
+package google.internal.identity.passwords.leak.check.v1;
 
 option optimize_for = LITE_RUNTIME;