Update uiautomator references in platform_testing/libraries/system-helpers/commands-helper/

* Replace "ub-uiautomator" (v2.2.0) with
  "androidx.test.uiautomator_uiautomator" (v2.3.0).

Bug: 235842600
Test: mmma .
Change-Id: I453c92df90951a1f26803e41d59713f05f4b78cb
2 files changed