Revert "Explicitly include libgui as a shared library in libgui_test."

This reverts commit 36127e6b.

Reason for revert: DroidMonitor: Potential culprit for http://b/402507915 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d6198bed29ffb56054490820e73ee30a718930d1)
Merged-In: I12af47f3ae45e9f9f0b4891f716121b959dc6f44
Change-Id: I12af47f3ae45e9f9f0b4891f716121b959dc6f44