Rename updateMediaLuma to updateMedianLuma.

Looks like a simple typo. I found it confusing, thought the function had
something to do with media.

Bug: 260624151
Test: passing existing tests.
Change-Id: I4a5f821a44d4eb32aa566a4c7ba2505ed8d35f88
Merged-In: I4a5f821a44d4eb32aa566a4c7ba2505ed8d35f88
(cherry picked from commit 65555750a379f43c0ed2a85498e1aeb1acdf7851)
1 file changed