aconfig: rename test flag `disabled_rw_2` -> `disabled_rw_in_other_namespace`

The flag `disabled_rw_2` is used to verify that aconfig can
auto-generate code for flags in different namespaces. Rename the flag to
`disabled_rw_in_other_namespace` to highlight that it belongs to a
different namespace than the other flags.

This CL is a semantic change only.

Bug: None
Test: atest aconfig.test
Change-Id: Ib82fdce0ca3f7cd56b9b3f80e44fe424a03a2ae4
diff --git a/tools/aconfig/tests/first.values b/tools/aconfig/tests/first.values
index 448fb3a..07d8d1d 100644
--- a/tools/aconfig/tests/first.values
+++ b/tools/aconfig/tests/first.values
@@ -18,7 +18,7 @@
 }
 flag_value {
     package: "com.android.aconfig.test"
-    name: "disabled_rw_2"
+    name: "disabled_rw_in_other_namespace"
     state: DISABLED
     permission: READ_WRITE
 }