Remove wired corpus name, use the one from the environment

Bug: 181825150
Test: run build/soong/build_kzip.bash, verify that the 'corpus' field
is still present and correct

Change-Id: I66cf44af9927d52c8fc014d93240d29c0e91c7ae

vnames.go.json

@@ -2,7 +2,6 @@
     {
         "pattern": "(.*)",
         "vname": {
-            "corpus": "android.googlesource.com/platform/superproject",
             "path": "@1@"
         }
     }

vnames.json

@@ -2,7 +2,6 @@
   {
     "pattern": "out/(.*)",
     "vname": {
-      "corpus": "android.googlesource.com/platform/superproject",
       "root": "out",
       "path": "@1@"
     }
@@ -10,9 +9,7 @@
   {
     "pattern": "(.*)",
     "vname": {
-      "corpus": "android.googlesource.com/platform/superproject",
       "path": "@1@"
     }
   }
 ]
-