Update remote-shell protocol to version 18

The set_bounds request, which supersedes set_window_geometry, allows
the client to specify a target display such that window bounds are
expressed in display rather than screen coordinates.

Bug: 77972398
Test: None
Change-Id: I120185425c65521eae8e6b9e4b195329dfab19b7
(cherry picked from commit 3cd9413e48566334235ee5a1ce2d5b8e1a8a0bdc)