Move activity tests back to presubmit

Change-Id: I623e044cd67a2dbf3cfa020c2c8f288ef5828e57

TEST_MAPPING

diff --git a/TEST_MAPPING b/TEST_MAPPING
index de28a49..51c7bd4 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,13 +2,13 @@
     "presubmit": [
         {
             "name": "IntentResolver-tests-unit"
+        },
+        {
+            "name": "IntentResolver-tests-activity"
         }
     ],
     "postsubmit": [
         {
-            "name": "IntentResolver-tests-activity"
-        },
-        {
             "name": "IntentResolver-tests-integration"
         }
     ]