Fix typo which prevented the system-api check from running

Test: atest under cts/tests/signature/api-check/system-api
the test actually runs
Change-Id: Ibc68277045779460d4723fe5207a447ea800b8c9
diff --git a/tests/signature/api-check/system-api/AndroidTest.xml b/tests/signature/api-check/system-api/AndroidTest.xml
index 23254ae..5f70478 100644
--- a/tests/signature/api-check/system-api/AndroidTest.xml
+++ b/tests/signature/api-check/system-api/AndroidTest.xml
@@ -32,7 +32,7 @@
         <option name="test-file-name" value="CtsSystemApiSignatureTestCases.apk" />
     </target_preparer>
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
-        <option name="package" value="android.signature.cts.api.systemt" />
+        <option name="package" value="android.signature.cts.api.system" />
         <option name="runner" value="repackaged.android.test.InstrumentationTestRunner" />
         <option name="class" value="android.signature.cts.api.SignatureTest" />
         <option name="instrumentation-arg" key="base-api-files" value="current.api" />