TBR mojo/v23proxy: Use .jiri_root/profile_db not .jiri_v23_profiles

The latter doesn't exist in the new profile world, so we should move
to the former.

Change-Id: I2ae49df7b5ec80cd61f3f5be3aadcee27da983b3
diff --git a/go/src/v.io/x/mojo/tests/util/mojo_shell_runner.go b/go/src/v.io/x/mojo/tests/util/mojo_shell_runner.go
index f8fa6b7..8c1bb05 100644
--- a/go/src/v.io/x/mojo/tests/util/mojo_shell_runner.go
+++ b/go/src/v.io/x/mojo/tests/util/mojo_shell_runner.go
@@ -24,7 +24,7 @@
 	if err != nil {
 		panic(err)
 	}
-	rd, err := profilesreader.NewReader(jirix, profilesreader.UseProfiles, filepath.Join(jirix.Root, ".jiri_v23_profiles"))
+	rd, err := profilesreader.NewReader(jirix, profilesreader.UseProfiles, filepath.Join(jirix.Root, ".jiri_root", "profile_db"))
 	if err != nil {
 		panic(err)
 	}