Remove host script(list_image)

the script is not used anywhere.

But: 399476012
Test: presubmit
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:bd1dda557e59e42da277da48db1181159889382d)
Merged-In: I73b6b961e5b63fa01f926419aea42a6e2cfc1413
Change-Id: I73b6b961e5b63fa01f926419aea42a6e2cfc1413