Don't run clean with --new-gradle on internal

Bug: 270105162
Change-Id: I903211920168c2893781d3af43c7786e10155010
diff --git a/tools/internal_test.py b/tools/internal_test.py
index 129b087..ade752c 100755
--- a/tools/internal_test.py
+++ b/tools/internal_test.py
@@ -106,7 +106,7 @@
 
 CLEAN_COMMANDS = [
     # Make sure we have a clean build to not be polluted by old test files
-    ['tools/gradle.py', 'clean', '--new-gradle'],
+    ['tools/gradle.py', 'clean'],
 ]
 
 # TODO(b/210982978): Enable testing of min xmx again