test: re-enable system tests (#670)

diff --git a/synth.py b/synth.py
index 49bf2dd..f692f70 100644
--- a/synth.py
+++ b/synth.py
@@ -10,8 +10,8 @@
 s.move(
     templated_files / ".kokoro",
     excludes=[
-        ".kokoro/continuous/common.cfg",
-        ".kokoro/presubmit/common.cfg",
-        ".kokoro/build.sh",
+        "continuous/common.cfg",
+        "presubmit/common.cfg",
+        "build.sh",
     ],
 )  # just move kokoro configs