Update uiautomator references in packages/apps/Settings/tests/unit

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

Bug: 235842600
Test: mmma .
Change-Id: I55c2d77b0bcd3b673de5a0b42170414de5fc3baf

tests/unit/Android.bp

@@ -31,7 +31,7 @@ android_test {
         "mockito-target-minus-junit4",
         "platform-test-annotations",
         "truth-prebuilt",
-        "ub-uiautomator",
+        "androidx.test.uiautomator_uiautomator",
         // Don't add SettingsLib libraries here - you can use them directly as they are in the
         // instrumented Settings app.
     ],