Remove unused Kotlin source glob from srcs am: 16db795dc8 am: c204b67a70

Original change: https://android-review.googlesource.com/c/platform/external/rust/beto-rust/+/3221803

Change-Id: I58bf8da016d40c01b35c90e43383f1d9cb1e1579
Signed-off-by: Automerger Merge Worker <[email protected]>