Update tests/tests/networksecurityconfig/manifest.xml

Remove:
<meta-data android:name="listener" android:value="com.android.cts.runner.CtsTestRunListener" />

The listener `com.android.cts.runner.CtsTestRunListener` is being deprecated. References are being actively removed.

See b/267766325 for the reasoning. Please leave a comment in the bug if there is a reason to keep it.

Bug: 267766325
Test: TH
Change-Id: I4ab292326bfcbe2a8e4e6f0095573b5033c2593e