DO NOT MERGE - Migrate remaining cts to androidx.test.

See go/jetpack-test-android-migration

Test: m cts
Exempt-From-Owner-Approval: automated refactoring, has already been reviewed by owners downstream
Bug: 127482512
Change-Id: If72aed95ef9e436bcc6e063abc0478eca365cc9b
diff --git a/hostsidetests/theme/generate_images.py b/hostsidetests/theme/generate_images.py
index d8df3bf..4b1b581 100755
--- a/hostsidetests/theme/generate_images.py
+++ b/hostsidetests/theme/generate_images.py
@@ -133,7 +133,7 @@
     print("Generating images on " + device_serial + "...")
     try:
         (out, err) = device.run_instrumentation_test(
-            "android.theme.app/android.support.test.runner.AndroidJUnitRunner")
+            "android.theme.app/androidx.test.runner.AndroidJUnitRunner")
     except KeyboardInterrupt:
         raise
     except: