Pass correct key for media generation in partial sync query

Bug: 201397213
Test: m
Change-Id: If8a0654b4bd4373f4c4aebfbed726d587cb08988
Merged-In: If8a0654b4bd4373f4c4aebfbed726d587cb08988
(cherry picked from commit 2afaf2c3c0fe28c0c070948072da34c04efb73e9)
5 files changed