Update TEST_MAPPING

Test: None

Bug: 236006683
Change-Id: Icb2958c4db133aa21bd868c6a8260f5490f316bc
diff --git a/TEST_MAPPING b/TEST_MAPPING
index a15764c..947b45f 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,10 +1,5 @@
 // Generated by update_crate_tests.py for tests that depend on this crate.
 {
-  "postsubmit": [
-    {
-      "name": "rustc-demangle-capi_test_src_lib"
-    }
-  ],
   "presubmit": [
     {
       "name": "rustc-demangle-capi_test_src_lib"